Drain Vigor

You strip the strength from a creature you can see within range and repair your wounds with it. At the end of each of the target's turns before the spell ends, the target must succeed on a Constitution saving throw or the target's Strength score decreases by 1 (to a minimum of 1) and you regain a number of hit points equal to a number of d4s x the target's new strength score. On a successful save, the spell ends. The reduction lasts until the target finishes a short or long rest.

At Higher Levels. If you cast this spell using a spell slot of 7th level or higher, the target's strength score is decreased by 2 and healing dice become d6s. If you cast this spell using a spell slot of 8th level or higher, the target's strength score is decreased by 3 and healing dice become d8s. If you cast this spell using a spell slot of 9th level or higher, the target's strength score is decreased by 4 and healing dice become d10s.