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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. The mod currently adds twenty two 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 respected 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 5,225 health (5,747 in Expert Mode). It is summoned with a Desert Medallion in the Desert.

Crabulon[edit | edit source]

Decapodita Sprout.png

Crabulon is a mushroom crab fought in the Underground Mushroom biome. It can spawn naturally and is 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 one-eyed brain with 5,120 health split over two phases (6,400 in Expert Mode). It is summoned with by killing a Hive Cyst or using a Teratoma in The Corruption.

The Perforator[edit | edit source]

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

The Perforators are a trio of fleshbound worms with 14,000 health split over three bosses (15,400 in Expert Mode). It is summoned by killing a Perforator Cyst or using Bloody Worm Food in The Crimson.

The Slime God[edit | edit source]

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

The Slime God is a boss encounter consisting of two separate Slime Gods and the Slime God's core. It has 16,000 health split over three bosses (19,200 in Expert Mode). It is summoned anywhere and at any time with an Overloaded Sludge.

Hardmode Bosses[edit | edit source]

Cryogen[edit | edit source]

Cryogen Trophy.png
Cryo Key.png

Cryogen is a large crystal of sealed frost magic.

Brimstone Elemental[edit | edit source]

Brimstone Elemental.png
Charred Idol.png

Brimstone Elemental is an efreeta in the Calamity biome of the Underworld.

Calamitas[edit | edit source]

Calamitas Trophy.png
Eye of Desolation.png

Calamitas is a large red eye similar to the Eye of Cthulhu.

The Leviathan[edit | edit source]

The Leviathan.png
Leviathan Trophy.png

The Leviathan encounter is a colossal aquatic aberration masked by its Siren Lure's amiable appearance. The Siren Lure has 39,000 health (42,900 in Expert Mode) and must be summoned by killing ???. Although intended to be fought during Hardmode, it can be summoned at any point in the game.

Astrum Deus[edit | edit source]

Astrum Deus.png

Astrum Deus is a huge worm that is summoned with the Starcore.

Astrageldon Slime[edit | edit source]

Astrageldon Slime.png
Astral Chunk.png

Astrageldon Slime is a huge slime that is summoned with the Astral Chunk. It causes an Astral Meteor to spawn upon its defeat.

The Plaguebringer Goliath[edit | edit source]

The Plaguebringer Goliath.png
Plaguebringer Goliath Trophy.png

The Plaguebringer Goliath is a large mechanical bee with 45,000 health (52,650 in Expert Mode). It is summoned with an Abomination in the Jungle

Ravager[edit | edit source]

Ancient Medallion.png

Ravager is a boss 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

Profaned Guardians are a boss summoned 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 boss summoned in the Hallow or Underworld using a Profaned Core.

Sentinels of the Devourer[edit | edit source]

Sentinels of the Devourer.png
Rune of Kos.png

Sentinels of the Devourer are a set of 3 bosses summoned using the Rune of Kos. One is summoned in the dungeon, another in the sky, and the final one in the underworld. With a new Rune being dropped after each boss is killed

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 950,000 health (1,045,000 in Expert Mode). It is summoned with a Cosmic Worm anywhere at Night.

Bumblebirb[edit | edit source]

Birb Pheromones.png

Bumblebirb is a bird that can be spawned in the Jungle after the Devourer of Gods has been defeated. 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). It 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 a superboss. It has 2,500,000 health (4,000,000) and is the final challenge of the Calamity Mod. It is summoned with the Eye of Extinction.

Mini Bosses[edit | edit source]

Earth Elemental[edit | edit source]

Earth Elemental.png

The Earth Elemental is a mini-boss that can be found rarely in the Cavern during Hardmode.

Cloud Elemental[edit | edit source]

Cloud Elemental.png

The Cloud Elemental is a mini-boss that can be found rarely near Floating Islands during Hardmode while it is raining.

Cnidrion[edit | edit source]


Cnidrion is a mini-boss that spawns randomly in the Desert.

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
Astrum Deus.png Astrum Deus
Astrageldon Slime.png Astrageldon Slime
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
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