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This page describes old mod content that was removed or replaced. The information here does not apply to the current version of the Calamity Mod.
Astrageldon Slime
Astrageldon Slime.png
AI TypeAstrageldon Slime AI
10-200 / 16-216 / 24-324
90 / 140 / 210 (pre-Moon Lord)
10,500 (post-Moon Lord)
Max Life61,000 / 97,600 / 129,720 / 188,600 (pre-Moon Lord)
640,000 (post-Moon Lord)
Defense0-20 (based on health)
KB Resist100%
Inflicts debuffGod Slayer InfernoGod Slayer Inferno
100% chance
Debuff duration2 seconds / 4 seconds
Debuff tooltipYour flesh is burning off
Immune toAll debuffs except:
Ichor (debuff)Cursed InfernoAbyssal FlamesArmor CrunchDemon FlamesPlagueNightwitherShredWhispering DeathSilva StunDaybrokenHoly FlamesMarked
Coins 20 Gold Coin.png (pre-Moon Lord)
3 Platinum Coin.png (post-Moon Lord)
Astrageldon map.png
Map Icon

Astrageldon Slime Trophy.png "A titanic slime infected by a star-borne disease..." Astrageldon Slime Trophy.png

The Astrageldon Slime was a Hardmode boss that has been replaced by Astrum Aureus. Defeating it caused an Astral Meteor to fall somewhere in the world.

After defeating the Moon Lord, the Astrageldon Slime began to drop Lunar Fragments. Additionally in Revengeance Mode or Death Mode, the Astrageldon Slime increased substantially in difficulty, increasing health and damage, and began to drop the Suspicious Looking Jelly Bean.


The Astrageldon Slime could be summoned at Night using the Astral Chunk. Despite being connected to the Astral Meteor biome, it could be summoned anywhere.


Astrageldon Slime behaved similarly to most Slimes and attempted to leap towards the player. Its damage, defense, movement speed and firing speed increased significantly as its health lowered. The Astrageldon Slime itself was massive, roughly twice as big as King Slime. Like King Slime, it'd teleport near the player if the player got too far away.


  • Periodically teleported into the air above the player in an attempt to crush them.
  • Fired eight fireballs of varying speeds in a symmetrical, star-like shape.
  • Attempted to shoot fireballs directly at the player, and it fired faster as its health decreases.
  • Spawned Astral Slimes as it took damage.

In Revengeance Mode

  • Once the Moon Lord was defeated, the Astrageldon Slime became significantly more difficult.


Image Name Condition
Astral Slime Astral Slime When damaged


  • Straying too far from it (such as flying to high altitudes) would cause it to despawn, as it couldn't properly teleport to the player.
  • The Astrageldon Slime's projectiles post-Moon Lord in Revengeance Mode were able to kill the player instantly as soon as they were touched, so it was advised to be very cautious and wary of them.



  • It was recommended to use Angel Treads to avoid the bosses' quick attacks, and to have some sort of triple or quadruple-jump accessory to dodge the boss itself.
  • The Adrenaline Meter was easier to build up while fighting Astrageldon Slime, as its attacks were very predictable.