Acidic Slime Crystal

Acidic slime crystals are spawned when a Giant ice cream, shadow orb, or crimson heart gets infected by The Slime. They also spawn naturally in the small underground slime biome that spawns in one small spot world upon creation.

They summon the Slimemils, A boss tower that you have to mine with a pickaxe to kill.

Acidic slime crystals spawn randomly in the above ground slime biome like plantera bulbs.

They look like rhombuses that are dripping blue slime.