Toxic Sludge

The Toxic Sludge is a Hardmode slime enemy that appear in the Underground and Cavern layers in place of ordinary slimes. They deal significantly increased damage and have a 50% chance of inflicting the Poisoned debuff, which they are also immune to.

Trivia

 * The Toxic Sludge is one of the few enemies in Terraria to have a visible smile, the others being Snow Balla and Snowman Gangsta.

History
Boue Toxique