what is the goto boss killing build for the t3 t4 content ?

Depends what you want to do and if you have pally or not.

Crackling is good if you don’t have pally.

Pally, I mean auradin is pratically afk once you learn the aura rota

Auradin is solid, i found faster boss kills with wing strike.
at least when it comes to paladin.

Wonder if death trap rouge can kill t4 bosses?

every s or a tier build for every class can easily kill t4 bosses, t4 is not hard lol

Wing strike is pretty good

It doesn’t matter at all. Every reasonably decent build when fully geared can delete t4 bosses in <2 seconds. Just play the builds you find most fun.

Killed echo of lilith so fast it skipped mechanics