Stone of the Soul-Taker

{p/b} Whilst attuned to this amulet, when you kill a unit you may use your reaction to expend a spell slot of third level or higher to raise the body as a Thrall as the Animate Dead spell. This thrall persists identically to an undead raised by Animate Dead.
You felt it for just a moment. A single mote of dark light. Something you couldn't quite understand, but its gleam...you couldn't help yourself. Embrace the sword. Forge the throne.