Voidwraith replaces your currently selected pet, either Mindbender or Shadowfiend. Voidwraith has a one-minute cooldown when talented into Mindbender and a 2-minute cooldown when talented into Shadowfiend. Voidwraith inherits the cooldown reduction per cast from Void Summoner based on the pet currently talented into. With Mindbender talented, you can expect around a 40-45-second cooldown, and with Shadowfiend talented, you can expect a 60-second cooldown. Voidwraith gains the Shadowfiend coefficients for Shadow Covenant, Inescapable Torment, and Essence Devourer even when talented into Mindbender (Despite the tooltips saying otherwise. This is likely a bug but has not been fixed/changed as of now.)