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The Calamity Mod expands on the number of bosses that can be challenged throughout the game, each featuring memorable, challenging AI and unique, powerful 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. To make the world feel more alive and give the bosses more of a purpose, many have lore entries, explanations about what they are and why they exist, associated with them. The mod currently adds twenty four 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.

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.

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 precautions are taken and 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]

Desert Scourge.png
Desert Scourge Trophy.png
Desert Medallion.png

The Desert Scourge is a very large spiked worm boss with 4,000 health (6,400 health in Expert Mode, 7,200 health in Revengeance Mode and 16,320 health in Death 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 drops the Ocean Crest in Expert Mode, an accessory which pacifies several Ocean enemies and allows for limitless underwater breathing. In Revengeance Mode, it also drops the Torrential Tear, an item that summons the rain, as well as the Scourge of the Desert, an early unlimited throwing weapon.

Crabulon[edit | edit source]

Decapodita Sprout.png
Crabulon Trophy.png

Crabulon is a mushroom crab with 3,800 health (6,080 health in Expert Mode, 7,200 in Revengeance Mode and 16,800 health in Death Mode) fought in the Underground Mushroom biome. It can be summoned by using a Decapodita Sprout while in a 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, which float down in the players direction, as it takes damage.

Crabulon drops mushroom-themed weapons and materials related to the 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]

The Hive Mind.png
Hive Mind Trophy.png
Hive Cyst.png

The Hive Mind is a large, brain-like amalgamation with 5,000 health (8,000 in Expert Mode, 10,560 in Revengeance Mode and 18,400 health in Death Mode). It is summoned by using a Teratoma in The Corruption or by killing a Hive Cyst, which spawns in The Corruption after defeating the Eater of Worlds. For its first phase it does not move, 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 floats and teleports towards the player, firing slime shots and 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 then they are hit.

The Perforators[edit | edit source]

The Perforators.png
Perforator Trophy.png
Bloody Worm Food.png
Perforator Cyst.png

The Perforators are a trio of fleshy worms, along with a main hive boss, with 13,300 health split over the 4 bosses (19,180 in Expert Mode, 21,100 in Revengeance Mode and 29,900 health in Death Mode). It is summoned by using Bloody Worm Food in The Crimson or by killing a Perforator Cyst, which spawns in The Crimson after defeating the Brain of Cthulhu. The Perforator Hive floats above the player, firing blood orbs 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.

The Slime God[edit | edit source]

The Slime God.png
Slime God Trophy.png
Overloaded Sludge.png

The Slime God consists of two separate, giant slimes (Crimson and Corruption-themed, the size of King Slime) and a smaller core. It has 14,800 health split over the 3 bosses (23,680 in Expert Mode, 30,400 in Revengeance Mode and 61,600 health in Death Mode). It is summoned anywhere and at any time with an Overloaded Sludge.

The Slime God itself will be invulnerable for most of the fight, flying around and attempting to ram the player, while leaving most of the fighting to its Ebonian and Crimulan bodyguards. These massive slimes will perform great jumps towards the player, firing abyssal balls at them and summoning slime spawn minions as they take damage. Upon reaching half health, the Slime Gods will split into two smaller, weaker versions of themselves. Once the splits are defeated, The Slime God will become vulnerable, increasing its ramming frequency and firing its own abyssal projectiles at the player.

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 duration.

Hardmode Bosses[edit | edit source]

Cryogen[edit | edit source]

Cryogen Trophy.png
Cryo Key.png

Cryogen is a crystal of sealed frost magic with 22,500 health (36,000 in Expert Mode, 40,000 in Revengeance Mode and 88,000 health in Death 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.

Brimstone Elemental[edit | edit source]

Brimstone Elemental.png
Charred Idol.png

The Brimstone Elemental is a defiled spirit with 20,000 health (32,000 in Expert Mode, 35,200 in Revengeance Mode and 96,000 health in Death Mode). She is summoned by using a Charred Idol in the Profaned Crags 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 brimstone bolts, and encasing herself in highly defensive rose petals while firing blasts of projectiles.

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 300,000 (480,000), and she begins dropping Bloodstone. She also begins dropping the Brimrose in Expert Mode, a mount with infinite flight time and high movement speed.

Calamitas[edit | edit source]

Calamitas Trophy.png
Eye of Desolation.png

Calamitas is a large scarlet eye with 39,000 total health (49,600 in Expert Mode, 69,600 in Revengeance Mode and 144,000 health in Death 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. When defeated, she resurrects herself and summons her brothers, Catastrophe and Cataclysm. The brothers will spit fireballs and spew a flamethrower, respectively, and charge toward the player. Calamitas will also spawns a Soul Seeker shield at half health, and summon swarms of Life Seekers (or resurrect her brothers in Expert Mode) throughout the fight.

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 invincibility frames are active.

After Providence is defeated, all of her stats get buffed, her health raises to 340,000 (544,000), and she begins dropping Bloodstone.

The Leviathan[edit | edit source]

The Leviathan.png
Leviathan Trophy.png

The Leviathan is a colossal aquatic aberration masked by The Siren's amiable appearance. The Siren has 21,000 health (33,600 in Expert Mode, 40,000 in Revengeance Mode, and 100,000 in Death Mode) and must be summoned by killing ??? in the Ocean. The Leviathan, appearing when The Siren reaches half health, has 79,000 health (126,400 in Expert Mode, 140,800 in Revengeance Mode, and 352,000 in Death 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.

Astrageldon Slime[edit | edit source]

Astrageldon Slime.png
Astral Chunk.png

Astrageldon Slime is a massive cosmic slime with 60,000 health (96,000 in Expert Mode, 104,000 in Revengeance Mode). When defeated, an Astral Meteor will land somewhere in the world. It can be summoned anywhere at anytime using an Astral Chunk. It hops around like a normal slime would while firing lasers in every direction. As it takes damage, it grows stronger and summons Astral Slimes.

Astrageldon Slime drops an abundance of Stardust. After Moon Lord has been defeated, it gains massive stat boosts and also begins dropping high amounts of Lunar Fragments, and, in Revengeance Mode, the Suspicious Looking Jelly Bean mount.

Astrum Deus[edit | edit source]

Astrum Deus.png

Astrum Deus is a group of 11 astral god worms that have 225,000 total health (360,000 in Expert Mode, 400,000 in Revengeance Mode and 544,000 health in Death Mode). Defeating them allows the player to mine Astral Ore from the Astral Meteor biome. They are summoned by using the Starcore anywhere at night. Of the worms in the swarm, there will be one that is longer and more translucent than the rest, which will be invincible until all other worms are killed. 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 weapons and an abundance of Stardust. It drops the Astral Bulwark accessory in Expert Mode, which provides immunity to the God Slayer Inferno debuff and causes astral stars to fall from the sky when hit.

The Plaguebringer Goliath[edit | edit source]

The Plaguebringer Goliath.png
Plaguebringer Goliath Trophy.png

The Plaguebringer Goliath is a bio-mechanical plague-bearing bee with 52,000 health (83,200 in Expert Mode, 89,600 in Revengeance Mode and 296,000 health in Death 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]

Ancient Medallion.png

The Ravager is an ancient automaton with 150,000 total health (240,000 in Expert Mode, 246,400 in Revengeance Mode and 318,400 health in Death 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 hit them with its hands. It will also launch fireballs, homing missiles and, after its head is destroyed, bursts of lasers in every direction. Each of its five body parts must be destroyed before the Ravager itself can be damaged.

The Ravager drops a blood-themed weapon and two powerful accessories: The Flesh Totem, which cuts enemy contact damage in half, and the Blood Pact, which doubles the player's maximum health, but allows them to be critically hit at a 25% chance.

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.

Post-Moon Lord Bosses[edit | edit source]

Profaned Guardians[edit | edit source]

Profaned Guardians.png
Profaned Shard.png

The Profaned Guardians are a boss with 130,000 total health (198,000 in Expert Mode), split across three entities.These entities each serve a different role in the fight, one as an attacker, one a defender, and one a healer. They are summoned by using a Profaned Shard in either the Underworld or the Hallow.

Providence, the Profaned God[edit | edit source]

Providence, the Profaned God.png
Providence Trophy.png
Profaned Core.png

Providence, the Profaned God is a fiery deity of light and dark with 205,000 health (328,000 in Expert Mode, 352,000 in Revengeance Mode and 725,000 health in Death 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 Underworld using a Profaned Core.

Sentinels of the Devourer[edit | edit source]

Signus Trophy.png
Ceaseless Void Trophy.png
Storm Weaver Trophy.png
Rune of Kos.png

Sentinels of the Devourer are a set of 3 bosses summoned using the Rune of Kos in different areas of the world. Ceaseless Void (150 / 400 health) is summoned in the Dungeon, Storm Weaver (400,000 / 640,000 health) in the Sky, and Signus, Envoy of the Devourer (230,000 / 368,000 / 400,000 / 512,000 health) in the Underworld. They each drop a material required to craft the Cosmic Worm.

Polterghast[edit | edit source]

Necroplasmic Beacon.png

Polterghast is an enormous ethereal being with 330,000 health (528,000 in Expert Mode, 560,000 in Revengeance Mode and 1,000,000 health in Death Mode). It can be summoned by killing 30 Phantom Spirits or by using the Necroplasmic Beacon in the Dungeon.

The Devourer of Gods[edit | edit source]

The Devourer of Gods.png
Devourer of Gods Trophy.png
Cosmic Worm.png

The Devourer of Gods is an enormous cosmic worm with 600,000 health (960,000 in Expert Mode, 1,000,000 in Revengeance Mode and 1,360,000 health in Death Mode). It is summoned with a Cosmic Worm anywhere at any time.

Bumblebirb[edit | edit source]

Birb Pheromones.png

Bumblebirb is a bumbling birb that has 350,000 health (525,000 in Expert Mode, 600,000 in Revengeance Mode and 825,000 health in Death Mode). It can be summoned using Birb Pheromones in the Jungle.

Jungle Dragon, Yharon[edit | edit source]

Jungle Dragon, Yharon.png
Yharon Trophy.png
Dragon Egg.png

Jungle Dragon, Yharon is an orange feathered dragon with 2,400,000 health (3,840,000 in Expert Mode, 4,000,000 in Revengeance Mode and 7,200,000 health in Death Mode). He is summoned with a Dragon Egg in the Jungle.

Superbosses[edit | edit source]

Supreme Calamitas[edit | edit source]

Supreme Calamitas.png
Eye of Extinction.png

Supreme Calamitas is an incredibly powerful superboss. She has 2,500,000 health (4,000,000 in Expert Mode, 5,000,000 in Revengeance Mode and 10,000,000 health in Death Mode) and has many different attacks. She is summoned anywhere at any time with the Eye of Extinction.

THE LORDE[edit | edit source]


THE LORDE is a joke Superboss that has 50,000,000 health and is currently the final challenge of the Calamity Mod. He is summoned anywhere with NO.

Mini Bosses[edit | edit source]

Cnidrion[edit | edit source]


The Cnidrion is a seahorse-like mini-boss with 1,300 (1,560) health. It spawns randomly in the Underground Desert.

Earth Elemental[edit | edit source]

Earth Elemental.png

The Earth Elemental is a large mini-boss with 4,000 (6,600) health. It will appear rarely in the Cavern layer during Hardmode, often ambushing unsuspecting players.

Cloud Elemental[edit | edit source]

Cloud Elemental.png

The Cloud Elemental is a mini-boss with 7,000 (10,500) health. She can be found rarely near Floating Islands during Hardmode while it is raining.

Plaguebringer[edit | edit source]


The Plaguebringer is a bio-mechanical bee mini-boss with 27,000 (38,000) health. It spawns randomly in the Jungle after Golem has been defeated, making the area quite hazardous to inhabit until the player acquires stronger gear.

Boss Progression[edit | edit source]

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

Boss summoning items[edit | edit source]

The Calamity mod makes town NPCs 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 Wizard.

Item NPC Price
Slime Crown.png Slime Crown Dryad.png Dryad 2 Gold Coin.png
Desert Medallion.png Desert Medallion 2 Gold Coin.png
Suspicious Looking Eye.png Suspicious Looking Eye 3 Gold Coin.png
Decapodita Sprout.png Decapodita Sprout 4 Gold Coin.png
Worm Food.png Worm Food 6 Gold Coin.png
Bloody Spine.png Bloody Spine 6 Gold Coin.png
Teratoma.png Teratoma 10 Gold Coin.png
Bloody Worm Food.png Bloody Worm Food 10 Gold Coin.png
Abeemination.png Abeemination Witch Doctor.png Witch Doctor 8 Gold Coin.png
Overloaded Sludge.png Overloaded Sludge Dryad.png Dryad 15 Gold Coin.png
Cryo Key.png Cryo Key Wizard.png Wizard 15 Gold Coin.png
Mechanical Worm.png Mechanical Worm Steampunker.png Steampunker 15 Gold Coin.png
Mechanical Eye.png Mechanical Eye 20 Gold Coin.png
Mechanical Skull.png Mechanical Skull 20 Gold Coin.png
Charred Idol.png Charred Idol Wizard.png Wizard 20 Gold Coin.png
Eye of Desolation.png Eye of Desolation 20 Gold Coin.png
Portable Bulb.png Portable Bulb Witch Doctor.png Witch Doctor 20 Gold Coin.png
Pumpkin Moon Medallion.png Pumpkin Moon Medallion Dryad.png Dryad 25 Gold Coin.png
Naughty Present.png Naughty Present 25 Gold Coin.png
Starcore.png Starcore Wizard.png Wizard 30 Gold Coin.png
Lihzahrd Power Cell.png Lihzahrd Power Cell Witch Doctor.png Witch Doctor 30 Gold Coin.png
Ancient Medallion.png Ancient Medallion 50 Gold Coin.png
Abombination.png Abomination 50 Gold Coin.png
Truffle Worm.png Truffle Worm Dryad.png Dryad 40 Gold Coin.png
Celestial Sigil.png Celestial Sigil Wizard.png Wizard 3 Platinum Coin.png
Profaned Shard.png Profaned Shard 10 Platinum Coin.png
Birb Pheromones.png Birb Pheromones Witch Doctor.png Witch Doctor 20 Platinum Coin.png
Characters: Enemies: Cosmic Elemental.png Pre-Hardmode • Shockstorm Shuttle.png Hardmode • Phantom Spirit.pngPost-Moon Lord • Calamitas.png Bosses
Promotional Content