Your Highwind Arrow has a 40% chance to have +100% increased 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.
Details
Highwind Arrow / Chance To Have Increased Critical Strike Added Critical Strike
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Highwind Arrow / Chance To Have Increased Critical Strike Proc Chance
Elarion