Cycle of Life and Death

9th-level transmutation

Casting Time: 1 action

Range: 60 feet

Components: V, S, M (a platinum ring inscribed with life and death symbols)

Duration: Concentration, up to 1 minute

You invoke the cycle of life and death within a 60-foot radius centered on a point you choose. All creatures in the area must make a Constitution saving throw. On a failed save, they take 15d10 necrotic damage and have their hit points reduced by an amount equal to the damage taken until they finish a long rest. On a successful save, they take half damage and their hit points are not reduced. While concentrating, you can use your action each turn to siphon 10d6 hit points from creatures still in the area and transfer them to yourself or allies within range.