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The Calamity Mod expands on the number of bosses that can be challenged at different points in the game, featuring unique drops and AI, making every encounter a memorable one. Most of them require the player to use an item to summon them, but others have more unique prerequisites. 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 three new boss encounters.

In Expert Mode, bosses drop Treasure Bags which contain unique and 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, 8,320 health in Revengeance Mode). It is summoned with a Desert Medallion in the Desert, and does not spawn naturally.

Crabulon[edit | edit source]

Decapodita Sprout.png
Crabulon Trophy.png

Crabulon is a mushroom crab with 3,000 health (4,800 health in Expert Mode, 7,200 in Revengeance Mode) fought in the Underground Mushroom biome. It can spawn naturally and can also be summoned with a Decapodita Sprout.

The Hive Mind[edit | edit source]

The Hive Mind.png
Hive Mind Trophy.png

The Hive Mind is a large, brain-like amalgamation with 4,000 health (7,200 in Expert Mode, 9,600 in Revengeance Mode. It is summoned by killing a Hive Cyst or using a Teratoma in The Corruption, and does not spawn naturally.

The Perforator[edit | edit source]

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

The Perforators are a trio of Crimson-themed worms, along with a main hive boss, with 13,300 health split across all bosses (22,890 in Expert Mode, 24,250 in Revengeance Mode). It is summoned by killing a Perforator Cyst or using Bloody Worm Food in The Crimson, and does not spawn naturally.

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 15,000 health split over the 3 bosses (24,000 in Expert Mode, 24,960 in Revengeance Mode). It is summoned anywhere and at any time with an Overloaded Sludge, and can also spawn naturally during a Hardmode slime rain.

Hardmode Bosses[edit | edit source]

Cryogen[edit | edit source]

Cryogen Trophy.png
Cryo Key.png

Cryogen is a crystal of sealed frost magic, with 14,000 health (22,400 in Expert Mode) (25,600 in Revengeance Mode). It is summoned by using a Cryo Key in the Snow biome, and does not spawn naturally.

Brimstone Elemental[edit | edit source]

Brimstone Elemental.png
Charred Idol.png

The Brimstone Elemental is an efreeta with 20,000 health (32,000 in Expert Mode) (35,200 in Revengeance Mode). After Providence is defeated, all of her stats are buffed, her health raises to 300,000 (480,000), and she begins dropping Bloodstone. She is summoned by using a Charred Idol in the Profaned Crags biome.

Calamitas[edit | edit source]

Calamitas Trophy.png
Eye of Desolation.png

Calamitas is a large red and gray eye similar to Retinazer. She has 34,000 health (40,800 in Expert Mode). After Providence is defeated, all of her stats get buffed and she begins dropping Bloodstone. Calamitas can be summoned using an Eye of Desolation at night.

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) and must be summoned by killing ??? in the Ocean. The Leviathan, appearing when The Siren reaches half health, has 42,000 (67,200) health. Although intended to be fought during Hardmode, she can be summoned at any point in the game.

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.

Astrum Deus[edit | edit source]

Astrum Deus.png

Astrum Deus is an astral god worm that has 150,000 health (240,000 in Expert Mode) (264,000 in Revengeance Mode). Defeating it allows the player to mine Astral Ore from the Astral Meteor biome. It is summoned by using the Starcore anywhere at night.

The Plaguebringer Goliath[edit | edit source]

The Plaguebringer Goliath.png
Plaguebringer Goliath Trophy.png

The Plaguebringer Goliath is a large, mechanical, plague-bearing bee with 48,000 health (76,800 in Expert Mode) (89,600 in Revengeance Mode). She is summoned by using an Abomination in the Jungle.

Ravager[edit | edit source]

Ancient Medallion.png

Ravager is an ancient automaton with 129,000 total health, split across five body parts. After Providence is defeated, all of its stats are buffed, its health raises to 1,990,000 total, and it begins dropping Bloodstone. It is summoned with the Ancient Medallion anywhere on the surface.

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 204,000 total health (289,600 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 270,000 health (432,000 in Expert Mode) (480,000 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 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 (250,000 / 400,000 / 440,000 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 335,000 health (536,000 in Expert Mode) (560,000 in Revengeance 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). 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). 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 1,150,000 health (1,840,000 in Expert Mode) (4,000,000 in Revengeance 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 1,400,000 health (2,240,000 in Expert Mode) (2,400,000 in Revengeance 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 Destroyer.png The Destroyer
Brimstone Elemental.png Brimstone Elemental
Skeletron Prime.png The Twins.png Skeletron Prime and The Twins
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
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
Abomination.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
Profaned Core.png Profaned Core 30 Platinum Coin.png
Necroplasmic Beacon.png Necroplasmic Beacon Dryad.png Dryad 30 Platinum Coin.png
Characters: Enemies: Cosmic Elemental.png Pre-Hardmode • Shockstorm Shuttle.png Hardmode • Phantom Spirit.pngPost-Moon Lord • Calamitas.png Bosses
Son of Yharon.png Familiars