I know the ability probably wasn't any good in hindsight or w/e, but I always enjoyed using Spirit of the Darkness Flame during Legion. It's a shame that hasn't made a comeback here. It added some fun sustain, single-target dps, and an extra layer to Demon Hunter's already pretty minimal design. Slowly building up stacks of Darkness Flame to then unload on some hapless enemy was a gas. Oh, well.
Is there anyway you can update this post? I think trees have changed a litlte. Please ITAMAE