Enhanced Grease

Slick 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 fall prone. A creature that enters the area or ends its turn there must also succeed on a Dexterity saving throw or fall prone.

You can also target a creature with the spell Enhanced Grease, drenching the creature, it gains advantage against being grappled, it also gains vulnerability to fire damage, a creature unwilling to be covered in grease must succeed on a Dexterity saving throw or become drenched.