Shard Explosion

As a swift action, you can cause jagged pieces of stone to explode outward from your body. These shards deal 1d6 points of piercing damage per two oracle levels (minimum 1d6) to all creatures within a 10-foot burst. A Reflex save halves this damage. In addition, the broken shards make the area difficult terrain until your next turn. You can use this ability once per day, plus one additional time per day at 5th level and every five levels thereafter.