Grease

Primary Action. Provokes. 10' by 10' surface target or single unattended object, Range 5. Concentration. Renders the target surface slippery. Targets moving into the square must make a AGL check or fall over prone. If they spend their Primary action they can move more cautiously, and not have to make the check. This spell can but cast on horizontal or vertical surfaces, but not objects in the possession of others. A held object affected by Grease requires an AGL check if they are used, or be dropped. The wielder can use a Reaction to attempt to catch it.