The Illuminant Slime is a monster that appears only in the Underground Hallow after enabling Hardmode. (killing the Wall of Flesh) The Illuminant Slime looks similar to other monsters from the slime family, it is pink-purple and emits some light. Upon moving, it leaves a movement trail like the Shadow Armor. It has 180 health points, though despite its low health, it has 30 defense and can deal up to 70 damage, so it is quite dangerous for an unprepared player, especially when joined by other Underground Hallow mobs.