20% chance to double Stun Duration
100% increased Stun Duration on Enemies
Cannot be Stunned 
Overwhelm is a notable Ascendancy passive skill for the Slayer that grants increased stun duration against enemies and immunity against stun. It also guarantees a stun against enemies on full life and a chance to double stun duration.
Overwhelm does not cause a hit to stun enemies at full life if it does not deal any damage.