Wax

An oleaginous wax covers the ground, walls and ceiling in a 30ft radius sphere centered on a point within range and turns into difficult terrain for the duration. The wax spreads around corners, covering all surfaces within range.

Each creature standing in its area must make a Dexterity save or fall prone when the wax appears. A creature that enters the area or ends its turn there must also succeed on a Dexterity save or fall prone.