conjuration 

Traditions arcane, primal

Cast [>>] somatic, verbal

Range 30 feet; Area 4 contiguous 5-foot squares or; Targets 1 object of 1 Bulk or less

Duration 1 minute

You conjure grease, with effects based on choosing area or target.

• Area All solid ground in the area is covered with grease. Each creature standing on the greasy surface must succeed at a Reflex save or an Acrobatics check against your spell DC or fall prone. Creatures using an action to move onto the greasy surface during the spell's duration must attempt either a Reflex save or an Acrobatics check to Balance. A creature that Steps or Crawls doesn't have to attempt a check or save.
• Target If you cast the spell on an unattended object, anyone trying to pick up the object must succeed at an Acrobatics check or Reflex save against your spell DC to do so. If you target an attended object, the creature that has the object must attempt an Acrobatics check or Reflex save. On a failure, the holder or wielder takes a –2 circumstance penalty to all checks that involve using the object; on a critical failure, the holder or wielder releases the item. The object lands in an adjacent square of the GM's choice

If you cast this spell on a worn object, the wearer gains a +2 circumstance bonus to Fortitude saves against attempts to grapple them.

Core Rulebook, page 342.