Adventures in the Borderlands
Pearl of Power
This unassuming pearl grants a boost to any spellcaster using it.
While this pearl is on your person, you can draw upon its power to cast any spell you know or have prepared, using a spell slot of 3rd level. Once used, the pearl changes in color, fading from a lustrous white to an ashen gray, and cannot be used again until 24 hours have passed.
While you have no other spell slots, defeat a challenging enemy using a spell cast with the spell slot provided by the pearl of power.