Sonnet of Souls

Gain the cantrip Toll the Dead

Beginning at the 3rd level, when a hostile creature dies within 30ft. of you, you capture its life essence in your momento. You are able to hold a number of souls in your momento equal to your proficiency bonus. When you complete a long rest, the souls in your momento dissipate. You may cast a Reaper spell by spending a number of souls equal to twice the level of the spell you are casting.

While you are hosting your void avatar, the range of soul capture is increased to 60ft.