Blight A5E

Necrotic energies drain moisture and vitality from the target, dealing 8d8 necrotic damage. Undead and constructs are immune to this spell.

A plant creature or magical plant has disadvantage on its saving throw and takes the maximum damage possible from this spell. A nonmagical plant that isn't a creature receives no saving throw and instead withers until dead.

The damage increases by 1d8 for each slot level above 4th.