Wind and Fire( Secrets of Sarlona, p. 119)
You have mastered the style of fighting with two cutting wheels at the same time, and you are adept at opening wounds with them.
If you hit the same creature with both of your cutting wheels in the same round, you tear open the wound and cause bleeding. The bleeding creature takes 1 point of damage per round until it receives a DC 15 Heal check or magical healing. Wounds from multiple successful uses of this style cause cumulative bleeding — a creature affected by this style three times takes 3 points of damage per round from bleeding.