Your Reaver's Edge, Blood Arc, Heart Splitter, and Rupture have a 6% chance to reset the cooldown of Grim Carve and grant you Grim Harvest for 8 seconds, causing your next Grim Carve to have +100% Critical Strike chance.
GRIEVOUS CRITICAL STRIKE
Any critical strike chance you have beyond 100% causes a grievous critical strike. Grievous critical strikes increase the base damage of the hit by an amount equal to the overflowing critical strike chance.
Gunde