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25% chance to gain an Endurance Charge when you Stun an Enemy
10% increased Stun Duration on Enemies per Endurance Charge
6% increased Area of Effect per Endurance Charge 
Unyielding is a Notable Ascendancy passive skill for the Juggernaut that grants increased damage, area of effect, and stun duration per endurance charge and grants a chance to gain an endurance charge when you stun an enemy.