Voidwalker has been a joke for years now.
Apparently it was “too good” at some point, Blizzard kneecapped it and never looked back.
As a side-note, I’ve been noticing aggro in Delves is pretty weird.
Many things that’ll just ignore my pet’s growl or go right back to attacking me, even after I’ve Feigned Death. It’s like, they know what aggro is and are actively learning lol.