For the notable passive skill that formerly known as "Unyielding", see
Sanctum of Thought
8% increased Damage per Endurance Charge 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.
Unyielding now grants 8% increased damage per endurance charge (from 5%) and 6% increased area of effect per endurance charge (from 5%).
Reworked. Previous version's mods listed below:
30% increased Damage while you have Fortify
1.5% of Maximum Life Regenerated per second while you have Fortify 25% increased effect of Fortify on You
Added "25% increased effect of Fortify on you."