Toxic Sludge

Type	Slime
Environment	Underground
AI Type	Slime AI
Damage	50/100/150
Max Life	150/300/450
Defense	18
KB Resist	20%/28%/36%
Banner	Toxic Sludge Banner
Immune to
Debuff	Poisoned
Debuff tooltip	Slowly losing life
Chance	50%
Duration	10 seconds20 seconds25 seconds
Coins	4 SC10 SC
Hurt
Killed

The Toxic Sludge is a Hardmode enemy and a slime variant that spawns in the Underground layer in place of ordinary slimes. It deals significantly increased damage and has a 1/2 (50%) chance of inflicting the Poisoned debuff for 10 / 20 / 25 seconds, which it is also immune to.

Like most other slimes, the Toxic Sludge 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)

Category:

Challenger

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

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

Trivia

The Toxic Sludge is one of the few enemies in Terraria to have a visible smile, the others being the Clown, Snow Balla, and Snowman Gangsta.
Disregarding the Gastropod, it is the only hostile slime that has a visible face.
The Toxic Sludge is one of two enemies that can inflict the Poisoned debuff yet does not spawn exclusively in the Jungle biome, with the other one being the Salamander(Desktop, Console and Mobile versions).

The Bestiary entry for the Toxic Sludge: "Distantly related to the common slime, the Toxic Sludge takes down its prey with potent toxins and a disarmingly toothy smile."