Illuminant Slime

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Illuminant SlimeHardmode exclusive
Illuminant Slime.gif
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png Master
AI TypeSlime AI
Max Life180/360/540
KB Resist15%/24%/32%
BannerIlluminant Slime BannerIlluminant Slime Banner(Desktop, Console and Mobile versions)
Immune toPoisoned
Coins4 SC10 SC

The Illuminant Slime is a Hardmode slime that spawns in the Underground Hallow biome. They replace normal cave Slimes (Black and Mother Slimes) in most cases. These slimes deal a large amount of damage and have more health than their Cavern counterparts. As suggested in their names, these slimes give off a small amount of light. Illuminant Slimes also leave an after-image like the Chaos Elemental and Illuminant Bat, which appears as a long, pink trail.

Like most other slimes, the Illuminant Slime will be passive towards any player with the Royal Gel(Desktop, Console and Mobile versions) accessory equipped.


Achievement Gelatin World Tour.png
Gelatin World Tour • Defeat every type of slime there is!
Defeat at least one of every type of slime. (Desktop, Console and Mobile versions)
Achievement Slimer.png
Slimer • “You have killed every type of slime!”
Defeat at least one of every type of slime. (Old-gen console version)


  • An easy way for early Hardmode players to defeat these is to lure them into lava, e.g. by grappling to a block above a pool of lava.


  • The BestiaryBestiary entry for the Illuminant Slime: "Slimes exposed to the light of the Hallow's crystals begin to emit that very same light, glowing brightly in the darkness."