Grease 2024
1st-level conjuration
Nonflammable grease covers the ground in a 10 foot square centered on a point within range and turns it into Difficult Terrain for the duration. When the grease appears, each creature standing in its area must succeed on a Dexterity saving throw or have the Prone condition. A creature that enters the area or ends its turn there must also succeed on that save or fall Prone.
Other versions
Source: System Reference Document 5.2 (Wizards of the Coast) · License: Creative Commons Attribution 4.0 details