Illuminant Slime

Type	Slime
Environment	Underground Hallow
AI Type	Slime AI
Damage	70/140/210
Max Life	180/360/540
Defense	30
KB Resist	15%/24%/32%
Banner	Illuminant Slime Banner(Desktop, Console and Mobile versions)
Immune to
Coins	4 SC10 SC
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_6.wav

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.

Achievements

Gelatin World Tour • “Defeat every type of slime there is!”

Defeat at least one of every type of slime. (Desktop, Console and Mobile versions)

Slimer • “You have killed every type of slime!”

Defeat at least one of every type of slime. (Old-gen console version)

Tips

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.

Trivia

The Bestiary 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."