Mordenkainen's Lost Notebook

Caustic Mire

4-level Conjuration

Sticky acidic slime the consistency of thick mud covers the ground in a 20-foot square centered on a point within range and turns it into difficult terrain for the duration. When a creature enters the spell’s area for the first time on a turn or starts its turn there, that creature must make a Dexterity saving throw. The creature takes 3d8 acid damage on a failed save, or half as much damage on a successful one