Basically its a crit focused version of blight with ebonpiercer. Couple things it tries to solve
- Stack enough corrupting/shadow to max shadowblight multipler. This is achieved with combo of tempers, paragon (scourge and/or darkness), and native DoT affixes.
- Cap attack speed. To max blighted affix, stack as many blights and blighted CE as possible.
- Resource gen. Make sure you can spam Blight without interruption
The build i was running was, heir of perdition, shroud, legendary gloves with blighted, legendary pants + cursed aura, boots + distilled anima, 2h axe + decay, ebonpiercer, RoSS, and Xfals. Paragons were gravekeep or darkness for start, flesh eater + scourge, fraility + eliminator, blood begets blood + abyssal, scent of death, essence.
The crits from shadow blight which procs i believe about 8 times per second are 2-10B. Procs from xfals are 500mil - 2b. Xfals is mostly to add AoE damage for clearing packs faster. I also tested using legendary ring with sacrifice aspect.
I think it will be about the same as standard dot blight in terms of its T4 speedfarming ability but, ive been struggling to get past T85 in the pit.