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Bosses are aggressive, resilient enemies that offer a substantial challenge to players. Defeating a boss is usually instrumental in advancing the game in some way. Each has its own particular way of being summoned. For example, most bosses have associated summoning items that can be used to spawn them manually under certain conditions, while there are others that will appear after the player interacts in a certain way with the environment. Event bosses will only appear during their respective events and leave when the event ends. Mini-bosses also exist and appear only during specific biomes after a certain boss is defeated, expressing the same amount of difficulty as many normal bosses.

The Calamity Mod expands on the number of bosses that can be challenged throughout the game, each featuring unique AI and drops. Most require the use of boss summoning items in order to spawn, but others have more unique prerequisites. The initial defeat of bosses (both vanilla and Calamity) typically results in some form of change within the world, be it new enemies appearing or a meteor crash, indicated by status messages to direct players towards the new content. Many also drop lore entries, usually explanations about what they are and why they exist. The mod currently adds twenty-two new boss encounters.

In Expert Mode, bosses drop Treasure Bags which contain powerful Expert-exclusive items in addition to their normal drops. However, many bosses also have new and unique attacks providing players with new challenges to surmount if they hope to reap the rewards. The Calamity Mod's new difficulty modes, Revengeance Mode and Death Mode, increase the challenge even further, often to levels that require rigorous training and complete knowledge of the boss fights if players hope to receive the valuable mode-exclusive rewards. There are other items that activate certain modes that can put the player to the test, further increasing the reward that the player can take, such as the Defiled Rune and Armageddon, while other items, such as the Iron Heart are for bragging rights.

Most bosses in Calamity are designed to be much more difficult than those of vanilla Terraria, offering a challenge even to seasoned players, but are not required to progress through the vanilla game's content. To make up for this, they often drop more powerful equipment and open up new tiers of progression. Any boss that is alive will inflict the Boss Zen debuff which reduces enemy spawn rates.

After the player has killed the Moon Lord, a whole new level of progression is unlocked, containing several very powerful bosses that will push the game's mechanics to their limits. These serve to test the player's skill and game knowledge and allow for additional tiers of weapons and items beyond what Terraria's endgame has to offer.

Unprepared players will find these bosses to be spectacularly difficult, but if proper preparations are made, all of them can be defeated at their respective level of progression. Players are advised to make use of arenas, potions and any other kind of aid they can muster before confronting these challenging bosses.

Pre-Hardmode Bosses[edit | edit source]

Desert Scourge[edit | edit source]

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For elaborate strategies on defeating the Desert Scourge, including Weapon and Arena recommendations, see Guide:Desert Scourge strategies.

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The Desert Scourge is a large, dry, spiked worm with 2,300 health (3,680 health in Expert Mode, and 4,240 health in Revengeance Mode). It is summoned with a Desert Medallion in the Desert, and does not spawn naturally. While it is intended to be one of the first bosses fought and has a relatively simple AI, its intimidating size and speed can easily overwhelm an unprepared player. It becomes a greater threat in Revengeance Mode, where two smaller Desert Scourges join it in the fight, and it is able to fire a barrage of sand bolts from its segments.

The Desert Scourge drops weapons themed around water and electricity, as well as many Victory Shards, an early game crafting material. It also drops many Angler quest rewards such as the Weather Radio or the Angler Earring. It drops the Ocean Crest in Expert Mode, an accessory that pacifies several Ocean enemies and allows for limitless underwater breathing. Additionally, it allows blocks in the Sunken Sea to be mined and enables Sandstorms.

Crabulon[edit | edit source]

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For elaborate strategies on defeating Crabulon, including Weapon and Arena recommendations, see Guide:Crabulon strategies.

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Crabulon is a mushroom crab with 3,000 health (4,800 in Expert Mode, and 6,400 in Revengeance Mode) fought in the Glowing Mushroom biome. It can be summoned by using a Decapodita Sprout while in the Glowing Mushroom biome. While it spawns initially passive, it begins to attack once damaged, jumping and lunging at the player. It fires bursts of mushroom projectiles and summons many Crab Shrooms and walls of mushrooms, which float down in the players direction, as it takes damage.

Crabulon drops mushroom-themed weapons and materials related to the Glowing Mushroom biome. It drops the Fungal Clump accessory in Expert Mode, which summons a minion that attaches to enemies, draining their health to heal the player.

The Hive Mind[edit | edit source]

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The Hive Mind is a large, brain-like amalgamation with 7,000 health (11,200 in Expert Mode, and 14,976 in Revengeance Mode). It is summoned by using a Teratoma in The Corruption or by killing a Hive Cyst. For its first phase it is immobile, teleporting from time to time, instead relying on its many corrupt minions to attack the player. After losing all of its health, it transitions into its second phase, fully healed and no longer bound to the ground. It now rushes and teleports towards the player, firing slime shots and performing special dash attacks while continuing to summon its servants.

The Hive Mind drops weapons themed around corruption and the dark, as well as True Shadow Scales, which can be used to craft its drops and other items. It drops the Rotten Brain in Expert Mode, which increases the player's strength as their health drops, and causes shade rain to fall when they are hit. After defeating it for the first time, Aerialite Ore will generate underground.

The Perforators[edit | edit source]

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The Perforators are a trio of fleshy worms, along with a main hive boss, with 11,950 total health split over the 4 bosses (18,121 in Expert Mode, and 20,537 in Revengeance Mode). It is summoned by using Bloody Worm Food in The Crimson or by killing a Perforator Cyst. The Perforator Hive floats above the player, firing blood clots and ichor blobs in an upward arc as well as directly at the player. As it loses health, it will spawn Perforator worms of increasing size and strength.

The Perforators drop weapons themed around flesh and blood, as well as Blood Samples, which can be used to craft their drops and other items. It drops the Bloody Worm Tooth in Expert Mode, which boosts the player's damage reduction and melee strength, doubling its effects if below half health. After they have been defeated for the first time, Aerialite Ore will generate underground.

The Slime God[edit | edit source]

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For elaborate strategies on defeating the Slime God, including Weapon and Arena recommendations, see Guide:Slime God strategies.

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The Slime God consists of two separate, giant slimes (the Ebonian Slime God and Crimulan Slime God, both the size of King Slime) and a smaller Slime God Core. It has 11,500 total health split over the 3 bosses (18,400 in Expert Mode, and 24,512 in Revengeance Mode). It is summoned anywhere and at any time with an Overloaded Sludge.

The Slime God itself will fly around very quickly, attempting to charge at the player while leaving most of the fighting to its Ebonian and Crimulan Slime God bodyguards. These slimes will perform great jumps towards the player while firing lingering mines, orbs and summoning their own minions. When they reach half health, they will split into smaller, weaker slime gods that will continue to attack. The Slime Gods will get stronger depending on which one is killed first.

The Slime God drops weapons themed around slime, The Corruption, and The Crimson, as well as Purified Gel, which can be used to craft its drops and several late Pre-Hardmode items. It drops the Mana Overloader in Expert Mode, which increases magic abilities at a certain cost. In Revengeance Mode, it also drops several units of Purified Jam, an incredibly valuable item that, when used, prevents almost all damage for a short duration.

Hardmode Bosses[edit | edit source]

Cryogen[edit | edit source]

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For elaborate strategies on defeating Cryogen, including Weapon and Arena recommendations, see Guide:Cryogen strategies.

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Cryogen is a crystal of sealed frost magic with 17,900 health (28,640 in Expert Mode, and 42,080 in Revengeance Mode). It is summoned by using a Cryo Key in the Snow biome. It has many phases that it transitions through as it loses health, each with different methods of attack, from firing a barrage of frost bolts to derping out and trying to ram the player, all the while summoning minions to assist it.

Cryogen drops ice-themed weapons, as well as Frigid Bars, which can be used to craft its drops and other Hardmode items. It drops the Soul of Cryogen in Expert Mode, a wing accessory with added bonuses. It also drops the Frost Flare in Revengeance Mode, which grants an extensive variety of benefits. Defeating it for the first time will generate Cryonic Ore in the Ice biome and cause the Archmage NPC to move into an available house.

Brimstone Elemental[edit | edit source]

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For elaborate strategies on defeating the Brimstone Elemental, including Weapon and Arena recommendations, see Guide:Brimstone Elemental strategies.

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The Brimstone Elemental is a defiled spirit with 30,000 health (48,000 in Expert Mode, and 65,600 in Revengeance Mode). She is summoned by using a Charred Idol in the Brimstone Crag biome. She has three different methods of attack which she switches between on a regular cycle: teleporting around and leaving behind brimstone eruptions, hovering frantically above the player while shooting fireballs, and encasing herself in highly defensive rose petals while firing blasts of projectiles. She also summons minions called Brimlings that shoot gravity affected brimstone fireballs and follow a similar movement pattern to the Brimstone Elemental's first phase.

The Brimstone Elemental drops brimstone-themed weapons and accessories, as well as the Gehenna accessory in Expert mode, which causes brimstone fireballs to occasionally fall from the sky when worn.

After Providence is defeated, all of her stats are buffed, her health raises to 240,000 (384,000 in Expert Mode, and 524,800 in Revengeance Mode), and she begins dropping Bloodstone. She also begins dropping the Brimrose in Revengeance Mode, a mount with infinite flight time and high movement speed.

Aquatic Scourge[edit | edit source]

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For elaborate strategies on defeating the Aquatic Scourge, including Weapon and Arena recommendations, see Guide:Aquatic Scourge strategies.

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The Aquatic Scourge is a mutated oceanic scourge with 73,000 health (116,800 in Expert Mode, and 136,000 in Revengeance Mode). It spawns naturally, although very rarely, in the Sulphurous Sea biome, and can also be summoned manually with Seafood. It constantly moves towards the player to ram them, both through the ground and through the air. It periodically vomits bursts of many projectiles, from sulphuric water and gas clouds to homing teeth, and summons several aquatic enemies to assist it in the fight.

The Aquatic Scourge drops weapons themed around water and electricity, much like the Desert Scourge to which it is the same species. It will also drop the Aquatic Emblem accessory in Expert Mode, which pacifies ocean enemies, grants unlimited water breathing, and slowly buffs the player's stats while they remain in water.

Calamitas[edit | edit source]

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For elaborate strategies on defeating Calamitas, including Weapon and Arena recommendations, see Guide:Calamitas strategies.

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Calamitas is a large scarlet eye with 37,500 total health (60,000 in Expert Mode, and 82,800 in Revengeance Mode). She is summoned by using an Eye of Desolation at night.

Calamitas behaves much like Retinazer, hovering around the player and firing lasers at them, though her lasers will burst into three fast, homing versions after a short time. Upon reaching 75% of her health, she enrages and begins shooting fireballs. Throughout the fight she summons her brothers Catastrophe and Cataclysm. The brothers will spit fireballs and spew a flamethrower, respectively, and charge toward the player. Calamitas also spawns a ring of Soul Seekers around her and swarms of Life Seekers at half health.

Calamitas drops several calamitous weapons and materials. She drops the Void of Calamity in Expert Mode, a cursed accessory which increases damage by up to 15% and causes brimstone fire to fall from the sky while immunity frames are active.

After Providence is defeated, all of her stats get buffed, her health raises to 112,500 (180,000 in Expert Mode, and 248,400 in Revengeance Mode), and she begins dropping Bloodstone.

Siren and Leviathan[edit | edit source]

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The Leviathan is a colossal aquatic aberration masked by The Siren's amiable appearance. The Siren has 27,400 health (43,840 in Expert Mode, and 66,560 in Revengeance Mode) and must be summoned by killing ??? in the Ocean. The Leviathan, appearing when The Siren reaches half health, has 69,000 health (110,400 in Expert Mode, and 145,120 in Revengeance Mode). Although intended to be fought after defeating Plantera, they can be summoned at any point in the game.

The Siren will periodically generate an ice shield to protect herself, while attacking the player with a variety of projectiles and summoning water clones to assist her. The Leviathan will spend most of her time at the player's side, repeatedly launching orbs of energy and summoning minions, while occasionally charging into the player. If either of them are defeated, the boss left alive will become enraged, increasing the aggressiveness of their attacks.

The Leviathan (or The Siren, depending on who is killed last) drops ocean-themed weapons and accessories. They also drop Leviathan Ambergris in Expert Mode, an accessory which grants many boosts and effects when submerged in liquid and releases poisonous seawater as the player moves.

Astrum Aureus[edit | edit source]

linkAstrum Aureus Trophy

For elaborate strategies on defeating Astrum Aureus, including Weapon and Arena recommendations, see Guide:Astrum Aureus strategies.

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Astrum Aureus is a massive astral-infected cyborg with 96,000 health (153,600 in Expert Mode, and 195,200 in Revengeance Mode). It can only be summoned on the Surface Astral Infection at night using an Astral Chunk. It crawls around and occasionally jumps into the air to crush the player. It also fires astral crystals and lasers at varying speeds at the player.

Astrum Aureus drops an abundance of Stardust, Fallen Stars and Aureus Cells as well as unlocking several enemy drops in the Astral Infection. After Moon Lord has been defeated, it begins dropping high amounts of Lunar Fragments, and, in Revengeance Mode, it gains a major stat boost and drops the Suspicious Looking Jelly Bean mount.

The Plaguebringer Goliath[edit | edit source]

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The Plaguebringer Goliath is a bee-like amalgamation of infected flesh and metal with 58,500 health (93,600 in Expert Mode, and 123,640 in Revengeance Mode). She is summoned by using an Abombination in the Jungle. Being an infected Queen Bee, she possesses similar attacks, although improved and much more dangerous. Upon reaching half health, The Plaguebringer Goliath will release a Plague Nuke Barrage, launching a multitude of devastating plague missiles in quick succession. She will periodically perform this attack for the rest of the fight.

The Plaguebringer Goliath drops plague-themed weapons and several Plague Cell Canisters. She drops the Toxic Heart in Expert Mode, an accessory that creates a damaging Plague aura around the player, though weakening them at high health amounts.

Ravager[edit | edit source]

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The Ravager is an ancient flesh golem with 141,665 total health (266,250 in Expert Mode, and 283,530 in Revengeance Mode), split across the main boss and its five body parts. It is summoned with the Ancient Medallion anywhere on the surface. It behaves similarly to the Golem, attempting to jump onto the player and slam back down on them and hit them with its claws. When its claws and feet are destroyed, sparks and fireballs will be shot from the empty sockets. It will also summon large stone pillars, fire-throwing pillars, homing missiles and, after its head is destroyed, bursts of lasers and white bolts in every direction. Each of its five body parts must be destroyed before the body itself can be damaged.

The Ravager drops flesh and bone themed weapons and two powerful accessories: The Flesh Totem, which cuts enemy contact damage in half every 15 seconds, and the Blood Pact, which doubles the player's maximum health, but allows them to be critically hit at a 25% chance. The Ravager also drops all ingredients to the Core of Calamity and also all the ingredients to the Life Alloy.

After Providence is defeated, all of its stats are buffed, its health raises to 1,030,000 (1,648,000) total, and it begins dropping Bloodstone. It also begins dropping the Bloodflare Core accessory in Expert Mode, which creates a life-draining aura around the player and grants numerous other benefits.

Astrum Deus[edit | edit source]

linkAstrum Deus Trophy

For elaborate strategies on defeating Astrum Deus, including Weapon and Arena recommendations, see Guide:Astrum Deus strategies.

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Astrum Deus is a group of 11 astral god worms that have 157,500 total health (252,000 in Expert Mode, and 374,080 in Revengeance Mode). Defeating them allows the player to mine Astral Ore from the Astral Infection biome. They are summoned by killing three Atlas enemies after defeating the Lunatic Cultist, or by using the Starcore in the Astral Infection at night. Of the worms in the swarm, there will be one that is longer and more translucent than the rest. The main worm and the small worms will alternate vulnerability depending on damage dealt. One of the smaller worms will have a ring of probes orbiting its head, which will each fire astral orbs that linger in place for a long duration. The probes will transition onto another worm if the one they are orbiting is killed.

Astrum Deus drops astral-themed items and an abundance of Lunar Fragments, as well as allowing Astral Ore to be mined. It drops the Astral Bulwark accessory in Expert Mode, which provides immunity to the Astral Infection debuff and causes astral stars to fall from the sky when hit.

Post-Moon Lord Bosses[edit | edit source]

Profaned Guardians[edit | edit source]

For elaborate strategies on defeating the Profaned Guardians, including Weapon and Arena recommendations, see Guide:Profaned Guardians strategies.

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The Profaned Guardians are the eternal servants to Providence with a total of 167,500 health (254,998 in Expert Mode), split across three entities. They are summoned by using a Profaned Shard in either the Underworld or the Hallow. Each of the three entities serve a different role in the fight and possess various attacks, such as charging, shooting fireballs and flares, and firing holy spears.

The Profaned Guardians only drop the Profaned Core, which is used to summon their Goddess.

Bumblebirb[edit | edit source]

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For elaborate strategies on defeating the Bumblebirb, including Weapon and Arena recommendations, see Guide:Bumblebirb strategies.

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Bumblebirb is a bumbling birb that has 227,500 health (364,000 in Expert Mode, and 404,000 in Revengeance Mode). It can be summoned using Birb Pheromones in the Jungle. It attacks by charging, flying around incredibly quickly, launching bursts of electric feathers and creating copies of itself.

Bumblebirb drops weapons themed around birds and red lightning, as well as Effulgent Feathers, which are used to craft the Dragon Egg and the Silva armor.

Providence, the Profaned Goddess[edit | edit source]

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For elaborate strategies on defeating Providence, including Weapon and Arena recommendations, see Guide:Providence, the Profaned Goddess strategies.

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Providence, the Profaned Goddess is a fiery deity of light and dark with 440,000 health (704,000 in Expert Mode, and 800,000 in Revengeance Mode). She is the first major Post-Moon Lord boss, and her defeat causes several prior bosses to be buffed. She is summoned in the Hallow or the Underworld using a Profaned Core. She has many dangerous attacks and several different phases, such as hiding in her cocoon while emitting flames and spears, dropping flare bombs on the player, shooting molten globes, and summoning Profaned Guardians. Additionally, she spawns a large crystal above the player or fire a Holy Ray depending on the biome she is spawned in.

Providence drops weapons themed around the profaned flame, and an abundance of Unholy Essence and Divine Geodes. If she is spawned in the Hallow, she will drop the highly mobile Elysian Wings. If she is spawned in the Underworld, she will drop the heavily defensive Elysian Aegis. She will always drop the Rune of Kos, a non-consumable item which is used to summon the Sentinels of the Devourer. Uelibloom Ore will generate in Mud Blocks upon her first defeat.

Sentinels of the Devourer[edit | edit source]

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For elaborate strategies on defeating the Storm Weaver, including Weapon and Arena recommendations, see Guide:Storm Weaver strategies.

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Sentinels of the Devourer are a set of 3 cosmic guardians summoned using the Rune of Kos in different areas of the world. The Ceaseless Void (200 / 400 health) is summoned in the Dungeon, Storm Weaver (700,000 / 1,120,000 health) in the Sky, and Signus, Envoy of the Devourer (280,000 / 448,000 / 712,800 health) in the Underworld.

Each sentinel drops cosmic-themed weapons and accessories, as well as materials for powerful equipment, which also serve as ingredients for the Cosmic Worm.

Polterghast[edit | edit source]

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For elaborate strategies on defeating the Polterghast, including Weapon and Arena recommendations, see Guide:Polterghast strategies.

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Polterghast is a ravenous ethereal being with 412,500 health (660,000 in Expert Mode, and 792,000 in Revengeance Mode). It can be summoned by killing 30 Phantom Spirits or by using the Necroplasmic Beacon in the Dungeon. It has 3 different forms and various attacks from spitting bouncing bolts and mines to trying to ram into the player and hit them with its hooks, all while summoning minions and clones of itself to assist it.

Polterghast drops phantoplasmic-themed weapons, as well as Ruinous Souls, which are used to craft the Bloodflare armor. It also drops the Affliction accessory in Expert Mode, which grants various powerful buffs to the player and their teammates. Defeating it causes Abyss and Sulphurous Sea minibosses to drop weapons and Adult Eidolon Wyrms to naturally spawn in the lower layers of the Abyss.

The Old Duke[edit | edit source]

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The Old Duke is an old fishron with 750,000 health (1,200,000 in Expert Mode, and 1,600,000 in Revengeance Mode). The Old Duke spawns after completing the Acid Rain event or can be summoned by fishing with a Bloodworm. It has 3 phases and multiple attacks, ranging from charging at the player to creating a massive sulphurous vortex.

The Old Duke drops sulphur-themed weapons and the Mutated Truffle in Expert Mode, which summons a Mini Old Duke that charges at enemies.

The Devourer of Gods[edit | edit source]

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The Devourer of Gods is an enormous cosmic worm with a total of 1,825,000 health (2,920,000 in Expert Mode, and 3,360,000 in Revengeance Mode). The Devourer of Gods is a difficult boss, requiring significant preparation before attempting to fight, and causing several changes to the world after its defeat. It is summoned with a Cosmic Worm anywhere at any time.

The Devourer of Gods drops cosmic-themed weapons, as well as Cosmilite Bars, a versatile Post-Moon Lord material. It also drops the Nebulous Core accessory in Expert Mode, which summons protective nebula stars, buffs player damage, and grants a chance to revive the player after they take fatal damage.

Jungle Dragon, Yharon[edit | edit source]

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For elaborate strategies on defeating Yharon, including Weapon and Arena recommendations, see Guide:Jungle Dragon, Yharon strategies.

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Jungle Dragon, Yharon is a godly dragon with 2,275,000 health (3,640,000 in Expert Mode, and 4,040,000 in Revengeance Mode). He is summoned with a Dragon Egg in the Jungle.

Yharon is incredibly powerful and has dozens of attacks and several phases, each harder than the last. Some of his attacks include spewing Detonating Flames, summoning massive flarenados, ramming at great speeds, and teleporting around the player. His second phase can only be fought after a buffed Mothron has been defeated, otherwise he will simply deem the player unworthy and leave. Once accessible, his second phase is very difficult as Yharon regains all of his health, and then assaults the player by launching fireballs, creating a ring of flares, and charging following a teleport.

After his first phase has been defeated, Solar Eclipses become significantly more difficult and Mothron will begin to drop Darksun Fragments. When his second phase has been defeated, Auric Ore, one of the final crafting materials, will generate underground. Jungle Dragon, Yharon drops weapons themed around dragons and fire, as well as the Yharim's Gift accessory in Expert Mode, which grants multiple powerful buffs and leaves behind exploding dragon dust as the player moves.

Superbosses[edit | edit source]

Supreme Calamitas[edit | edit source]

For elaborate strategies on defeating Supreme Calamitas, including Weapon and Arena recommendations, see Guide:Supreme Calamitas strategies.

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Supreme Calamitas is an incredibly powerful brimstone superboss, generally regarded currently as the most difficult boss in the Calamity Mod. She has 5,000,000 health (8,000,000 in Expert Mode, and 8,800,000 in Revengeance Mode). She is summoned anywhere at any time with the Eye of Extinction. Supreme Calamitas' attacks are primarily enormous waves or floods of projectiles which are very difficult to dodge, which become more chaotic and introduce more elements as the fight progresses. She also summons servants to aid her, such as her brothers, Soul Seekers, and Sepulcher.

Her main drop is Calamitous Essence, which is used to craft Shadowspec Bars, the final crafting material. She can also drop various Developer items directly.

Mini Bosses[edit | edit source]

Giant Clam[edit | edit source]

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The Giant Clam is a large clam mini-boss with 1,250 (2,500) health in Pre-Hardmode, and 7,500 (15,000) in Hardmode. It makes nearby Clams aggressive and attacks by teleporting on top of the player and closing its shell, spawning additional Clams. In Hardmode, it gains additional attacks utilizing psychic pearls. It can be found uncommonly in the Sunken Sea.

It drops the Giant Pearl in Pre-Hardmode. In Hardmode, it additionally drops Mollusk Husks, the Poseidon, the Clamor Rifle, the Shellfish Staff, and the Clam Crusher. It also drops the Sea King if he is not already present in the world.

Cloud Elemental[edit | edit source]

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The Cloud Elemental is a well-armored air-based mini-boss with 6,000 (12,000) health. She attacks by summoning sets of three tornadoes, which linger for a certain amount of time before she summons them again. She can be found rarely in Space during Hardmode while it is raining.

She drops the Eye of the Storm, which summons a friendly cloud elemental and can be crafted into the Heart of the Elements, as well as the Storm Saber.

After Providence is defeated, all of her stats get buffed, her health raises to 30,000 (60,000), and she will rarely drop the Thunderstorm.

Earth Elemental[edit | edit source]

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The Earth Elemental is a large armored earth-based mini-boss with 3,800 (7,600) health. It travels through blocks, floating directly at the player to deal contact damage. It also fires bursts of rock projectiles at the player. It will appear rarely in the Cavern layer during Hardmode, often ambushing unsuspecting players.

It drops earth and rock related weapons like the Aftershock, Slag Magnum and Earthen Pike, as well as the Arid Artifact which starts a Sandstorm shortly after use.

Cragmaw Mire[edit | edit source]

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The Cragmaw Mire is a sulphuric shell-like mini-boss with 6,000 / 10,800 health in Tier 2 and 46,600 / 83,880 health in Tier 3 that spawns in the Acid Rain Event after Aquatic Scourge is defeated. It fires lasers and bubbles. In the 3rd Tier, it gains a 2nd phase where it fires teeth at the player and pulls them towards it with a tether.

It drops the Spent Fuel Container and the Nuclear Rod.

Armored Digger[edit | edit source]

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The Armored Digger is a steel worm mini-boss with 20,000 (40,000) health that spawns in the cavern layer after Plantera has been defeated. It attacks by charging at the player and turning, akin to The Destroyer. It also fires small yellow projectiles from its segments, which fall and linger on the ground.

It drops Demonic Bone Ash, and occasionally, Draedon's Remote which summons buffed variants of the three Mechanical Bosses. It also rarely drops Lead Wizard.

Great Sand Shark[edit | edit source]

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The Great Sand Shark is a vicious Sandstorm shark mini-boss with 8,000 (12,800/17,600) health. It swims through the sand and leaps out to attack the player with special movements, while summoning Sand Sharks to assist it. It either spawns after killing 10 Sand Sharks, or is summoned by using a Sandstorm's Core in the Desert.

It drops a Grand Scale, which can be used to craft powerful upgrades to previous weapons.

Plaguebringer[edit | edit source]


The Plaguebringer is a bio-mechanical bee mini-boss with 3,000 (6,000) health. It acts very similar to Queen Bee, cycling between a horizontal ram and shooting stingers from above while spawning Plague Chargers. It appears randomly in the Jungle after Golem has been defeated, making the area quite hazardous to inhabit until the player acquires stronger gear.

It drops an abundance of Plague Cell Canisters, which can be crafted into several plague-related items.

Mauler[edit | edit source]


The Mauler is a mutant shark mini-boss with 165,000 (330,000) health. It is passive at first, only attacking the player if they get too close or deal damage to it. Once aggressive, it swims extremely fast towards the player while shooting sulphuric mist at them. It also explodes if it is out of the water for too long. It spawns rarely in the Sulphurous Sea.

It drops several Shark Fins, as well as the Sulphuric Acid Cannon after Polterghast has been defeated.

Colossal Squid[edit | edit source]

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The Colossal Squid is an enormous cephalopodic mini-boss with 220,000 (440,000) health. It is passive at first, only attacking the player if they get too close or deal damage to it. Once aggressive, it attempts to float onto the player and crush them underneath itself or shoot ink bombs. It appears in the third layer of the Abyss.

It drops lots of Black Ink, as well as the Calamari's Lament after Polterghast has been defeated.

Eidolon Wyrms[edit | edit source]

Eidolon Wyrm (Juvenile).png

Eidolon Wyrms are massive ghostly serpent mini-bosses. The Juvenile Eidolon Wyrm has 160,000 (320,000) health, while the Adult Eidolon Wyrm has 1,000,000 (2,000,000) health. They initially float nearby the player and deal no damage, but will become hostile if attacked. They attack by dealing contact damage with their heads, as well as summoning ice shards and streaks of lightning. The Adult will also throw the player around with telekinesis. They appear in two lowest layers of the Abyss, with the Adult spawning through either the usage of the Rod of Discord in the Abyss, or naturally after Polterghast has been defeated.

They drop an abundance of Lumenyl, Ectoplasm and Voidstone, as well as the Soul Edge and the Eidolic Wail after Polterghast has been defeated.

Reaper Shark[edit | edit source]

Reaper Shark.png

The Reaper Shark is a brutal yet stealthy mini-boss with 190,000 (380,000) health. It is passive at first, only attacking the player if they get too close or deal damage to it. Once aggressive, it swims towards the player, being able to pass through blocks, and also charges them occasionally. It appears in the two lowest layers of the Abyss.

After Polterghast has been defeated, it drops the Valediction, The Reaper, and Reaper Teeth, along with several Cloaking Glands.

Nuclear Terror[edit | edit source]

Nuclear Terror.png

The Nuclear Terror is a radioactive crustacean-like mini-boss with 360,420 (576,672) health. It attacks the player by teleporting and firing barrages of irradiated shots. It spawns during the Acid Rain event after Polterghast has been defeated.

Vanilla Boss Additions[edit | edit source]

The Calamity Mod adds several differences to vanilla bosses ranging from drops to behavior in other difficulty modes.

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Boss Progression[edit | edit source]

Icon Name
King Slime.png King Slime
Desert Scourge Desert Scourge
Eye of Cthulhu.png Eye of Cthulhu
Crabulon Crabulon
Eater of Worlds.png Brain of Cthulhu.png Eater of Worlds or Brain of Cthulhu
The Hive Mind (Phase 2).png The Perforators.png The Hive Mind or The Perforators
Queen Bee.png Queen Bee
Skeletron.png Skeletron
The Slime God The Slime God
Wall of Flesh.png Wall of Flesh
Icon Name
Cryogen Cryogen
The Twins.png The Twins
Brimstone Elemental Brimstone Elemental
The Destroyer.png The Destroyer
Aquatic Scourge Aquatic Scourge
Skeletron Prime.png Skeletron Prime
Calamitas Calamitas
Plantera.png Plantera
Siren and Leviathan Siren and Leviathan
Astrum Aureus Astrum Aureus
Golem.png Golem
The Plaguebringer Goliath The Plaguebringer Goliath
Duke Fishron.png Duke Fishron
Ravager Ravager
Lunatic Cultist.png Lunatic Cultist
Astrum Deus Astrum Deus
Moon Lord.png Moon Lord
Post-Moon Lord
Icon Name
Profaned Guardians Profaned Guardians
Bumblebirb Bumblebirb
Providence, the Profaned Goddess Providence, the Profaned Goddess
Sentinels of the Devourer Sentinels of the Devourer
Polterghast Polterghast
The Old Duke The Old Duke
The Devourer of Gods The Devourer of Gods
Jungle Dragon, Yharon Jungle Dragon, Yharon
Supreme Calamitas Supreme Calamitas

Boss summoning items[edit | edit source]

The Calamity Mod enables town NPCs to sell boss summons after that boss has been killed in the world. Most of the Pre-Hardmode summoning items are sold by the Dryad and most of the Hardmode summoning items are sold by the Witch Doctor.

NPC Item Price
Sea KingSea King Desert Medallion Desert Medallion 2 Gold Coin.png
Seafood Seafood 20 Gold Coin.png
Truffle Worm Truffle Worm 40 Gold Coin.png
Bloodworm Bloodworm 8 Platinum Coin.png
DryadDryad Slime Crown Slime Crown 2 Gold Coin.png
Suspicious Looking Eye Suspicious Looking Eye 3 Gold Coin.png
Decapodita Sprout Decapodita Sprout 4 Gold Coin.png
Worm Food Worm Food 6 Gold Coin.png
Bloody Spine Bloody Spine 6 Gold Coin.png
Teratoma Teratoma 10 Gold Coin.png
Bloody Worm Food Bloody Worm Food 10 Gold Coin.png
Overloaded Sludge Overloaded Sludge 15 Gold Coin.png
Witch DoctorWitch Doctor Abeemination Abeemination 8 Gold Coin.png
Portabulb Portabulb 20 Gold Coin.png
Lihzahrd Power Cell Lihzahrd Power Cell 30 Gold Coin.png
Ancient Medallion Ancient Medallion 50 Gold Coin.png
Abombination Abombination 50 Gold Coin.png
Birb Pheromones Birb Pheromones 5 Platinum Coin.png
WizardWizard Charred Idol Charred Idol 20 Gold Coin.png
Astral Chunk Astral Chunk 25 Gold Coin.png
Celestial Sigil Celestial Sigil 3 Platinum Coin.png
Profaned Shard Profaned Shard 10 Platinum Coin.png
SteampunkerSteampunker Mechanical Worm Mechanical Worm 20 Gold Coin.png
Mechanical Eye Mechanical Eye 20 Gold Coin.png
Mechanical Skull Mechanical Skull 20 Gold Coin.png
ClothierClothier Pumpkin Moon Medallion Pumpkin Moon Medallion 25 Gold Coin.png
Naughty Present Naughty Present 25 Gold Coin.png
ArchmageArchmage Cryo Key Cryo Key 15 Gold Coin.png

See Also[edit | edit source]