Martyrdom

From WoW: IncGamers World of Warcraft Wiki

Talent: Martyrdom
Effect: Gives you a % chance to gain the Focused Casting effect that lasts for 6 sec after being the victim of a melee or ranged critical strike. The Focused Casting effect prevents you from losing casting time when taking damage and increases resistance to Interrupt effects by a %.
Statistics: Rank 1 = 50% chance to gain the Focused Casting effect and increases resistance to Interrupt effects by 10%, Rank 2 = 100% chance to gain the Focused Casting effect and increases resistance to Interrupt effects by 20%.