Keen Edge, Psionic

This power makes a weapon magically keen, improving its ability to deal telling blows. This transmutation doubles the threat range of the weapon. A threat range of 20 becomes 19–20, a threat range of 19–20 becomes 17–20, and a threat range of 18–20 becomes 15–20. The power can be manifested only on piercing or slashing weapons. If manifested on arrows or crossbow bolts, the keen edge on a particular projectile ends after one use, whether or not the missile strikes its intended target. (Treat shuriken as arrows, rather than as thrown weapons, for the purpose of this power.)

Multiple effects that increase a weapon’s threat range (such as the keen edge spell and the Improved Critical feat) don’t stack. You can’t manifest this power on a natural weapon, such as a claw.