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Astrageldon Slime

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Astrageldon Slime
Astrageldon Slime.png
Type Boss
Environment Surface
AI Type Astrageldon Slime AI
Damage Melee:
10-200 / 16-216 / 16-226 / 24-324
90 / 140 / 147 / 210 (pre-Moon Lord)
7,350 / 10,500 (post-Moon Lord)
Max Life 61,000 / 97,600 / 112,800 / 164,000 (pre-Moon Lord)
640,000 (post-Moon Lord)
Defense (DR) 0-20 (based on health) (15% DR)
KB Resist 100%
Inflicts debuff
God Slayer Inferno.png God Slayer Inferno
100% chance
Debuff duration 2 seconds / 4 seconds
Debuff tooltip Your flesh is burning off
Immune to: All debuffs except:
Ichor (debuff).png Cursed Inferno.png Abyssal Flames.png Armor Crunch.png Demon Flames.pngPlague.png Nightwither.png Shred.png Whispering Death.png Silva Stun.png Stardust Dragon.png Holy Flames.png Marked for Death.png
Coins 20 Gold Coin.png (pre-Moon Lord)
3 Platinum Coin.png (post-Moon Lord)
Item (Quantity) Rate
Stardust.png Stardust
• 30-40
Astral Jelly.png Astral Jelly
• 9-12 / 12-16
Fallen Star.png Fallen Star
• 20-40
Vortex Fragment.png Vortex Fragment
• 12-60 / 18-90
Post-Moon Lord
Nebula Fragment.png Nebula Fragment
• 12-60 / 18-90
Post-Moon Lord
Stardust Fragment.png Stardust Fragment
• 12-60 / 18-90
Post-Moon Lord
Solar Fragment.png Solar Fragment
• 12-60 / 18-90
Post-Moon Lord
Lesser Healing Potion.png Lesser Healing Potion
• 1-15
Astrageldon Slime Trophy.png Astrageldon Slime Trophy
Astrageldon Slime (Lore).png Astrageldon Slime (Lore)
• Always on first kill
Treasure Bag (Astrageldon Slime).png Treasure Bag (Astrageldon Slime)
• in Expert Mode only

Astrageldon map.png
Map Icon
Astrageldon Slime Trophy.png "A titanic slime infect by a star-borne disease..." Astrageldon Slime Trophy.png

The Astrageldon Slime is a Hardmode boss.

After defeating the Moon Lord in Revengeance Mode or Death Mode, the Astrageldon Slime will increase substantially in difficulty, increasing health and damage. It will also start to drop Lunar Fragments.


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


Astrageldon Slime behaves similarly to most Slimes and attempts to leap towards the player. Its damage, defense, movement speed and firing speed will increase significantly as its health lowers. The Astrageldon Slime itself is massive, roughly twice as big as King Slime. Like King Slime, it'll teleport near the player if the player gets too far away.


  • Periodically teleports into the air above the player in an attempt to crush them.
  • Fires eight fireballs of varying speeds in a symmetrical, star-like shape.
  • Attempts to shoot fireballs directly at the player, and will fire faster as its health decreases.
  • Spawns Astral Slimes as it takes damage.

In Revengeance Mode

  • Once the Moon Lord is defeated, the Astrageldon Slime becomes significantly more difficult.


Image Name Condition
Astral Slime.png Astral Slime When damaged


  • Beware of straying too far from it (such as flying to high altitudes), as it can despawn if it can't properly teleport to the player.
  • Astrageldon Slime's projectiles post-Moon Lord in Revengeance Mode are able to kill the player instantly as soon as they are touched, so it is advised to be very cautious and wary of them.


  • It is 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 is easier to build up while fighting Astrageldon Slime, as its attacks are very predictable.


  • Astrageldon Slime's theme is Cosmic Disgust, which was composed by the artist DM DOKURO.
  • It is a reference to the Armageddon Slime from the Exxo Avalon mod.
  • Its name is a portmanteau of the words astral, armageddon and gel.
  • Although it is a boss and treated as such, the Astrageldon Slime has no Boss Mask drop.
Characters: Enemies (List): Cosmic Elemental.png Pre-Hardmode • Shockstorm Shuttle.png Hardmode • Impious Immolator.png Post-Moon Lord • Calamitas.png Bosses
Promotional Content