Marked for execution by X. Strikes against you will grant them stacking Critical Strike as they attempt to finish their work.
Mark your target for execution, increasing your Haste by 1.2003 × SP for 20 sec. While the target is marked, each of your attacks against them grants an additional 0.0857 × SP Critical Strike, as the Void urges you to finish the kill, up to a maximum of X Critical Strike.