Bone Spirit uses several compounding effects to stack multipliers of damage in addition to using
Paingorger's Gauntlets and
Shattered Spirit's Aspect to dish out more subsequent damage and essence regeneration. We have access to several tools to control monsters to maximize the effects specifically,
Corpse Tendrils as the core of the build to pull packs in,
Bone Storm to apply the
Paingorger's Gauntlets mark with either Bone Storm, Blood Mist, or Corpse Tendrils, then
Bone Spirit! Often in the end game, you will deal so much damage that positioning is all you need to allow Bone Spirit to have a unique endgame experience.