Verified for patch 16.8.1

Shockwave

Combat Start: Unleash a shockwave forward that deals 15% of Graves' max Health as magic damage and stun enemies hit for 2 seconds.

Source

Factory New

Effects

ShockwavePercentMaxHealthDamage: 0.15
ShockwaveStunDuration: 2

Shockwave enables

Stun On the Menu

Disables the target for a duration: no movement, no attacks, no ability casts.