Your skin becomes as hard as iron, allowing you to shrug off even the deadliest blows.

At-Will   ✦     Psionic
Standard Action      Personal

Effect: Until the end of your next turn, roll a d20 whenever you take damage. On a 10 or higher, the damage is reduced to 0. Otherwise, the damage is halved.

Published in Player's Handbook 3, page(s) 59.