Enervating Ray

You point your weapon and fire a sickly green ray of enervating energy at a creature within range. Make a ranged spell attack against the target. On a hit, the target takes 6d8 necrotic damage, and its hit point maximum is reduced by an amount equal to half the necrotic damage taken. This reduction lasts until the target finishes a long rest.

At Higher Levels: When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th.