Wither - Kibble's Tasty

Dark energy tears the moisture from a body, sapping it of life and vitality. The target must make a Constitution saving throw. The target takes 4d10 necrotic damage on a failed
save and becomes withered until the start of your next turn, or half as much on a successful one and does not become withered. A withered creature gains vulnerability to fire damage if they are not resistant to fire damage, or loses their resistance to fire if they are resistant to fire.

At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d10 for each slot level above 5th.