As an action, you can create this vial of oily grease. As an action, a creature can throw the vial at a point within 9 meters. Slick grease covers the ground in a sphere twice as big as normal centered on the point and turns it into difficult terrain for the duration.
When the grease appears, each creature standing in its area must succeed on a Reflex saving throw or fall prone. A creature that enters the area or ends its turn there must also succeed on a Reflex saving throw or fall prone.
If any fire touches the grease, it ignites. When a creature enters the burning area for the first time on a turn or starts its turn there, the creature must make a Reflex saving throw.
On a failed save, a creature takes 1d6 fire damage and is burning 1.
On a successful save, a creature takes half as much damage and doesn’t start