Unyielding Strike in an Ability in Death's Gambit. Abilities are special skills that can be performed depending on the Weapons you have equipped (much like Dark Souls 3). Ability use consumes Soul Energy, that you get from performing specific actions based on your Class.
Unyielding Strike Effect
A slow, heavy smash that consumes all of your soul energy. Damage dealt increases as more energy is consumed. Increases energy gained by attacks for the next 10 seconds.
How to unlock Unyielding Strike