Endless Hunger

Dark shadows wring out from you and permeate in a 60 ft radius around you.

All creatures ,excluding undead and constructs, that you deem as targets who start their turn inside the radius of the spell and fail a Constitution saving throw lose an amount of their maximum hit point equal to (2d4 + your spell casting modifier). You gain the hit point drained from creatures this way.

the effect lasts for 1 hour, after which the damage done is reverted and return to normal.