When a cleric casts this spell over rough earth or sand, fountains of flammable oil spout up from the ground, covering everything within a 15-foot radius. The oil itself isn't particularly dangerous, though it will cause the subject's attacks and saves to suffer by -2. The real danger occurs if the subject is ignited. Burning oil causes 2(16 points of damage in the first round, and 1d6 in the second. The subject should also check his equipment each round to make sure that it doesn't ignite. The oil burns off by the third round, and attack and saving throw penalties are ignored.
If the oil isn't ignited, it will remain until removed by no less than 3 turns of scrubbing or washing.
Notes: Uncommon for priests from the Dark Sun setting; otherwise, very rare.