Withering

Weapon Enchantment:
Whenever you hit a creature using this weapon with an attack that does piercing or slashing damage, a stack of withering is applied to that creature. Withering manifests as a black mark that spreads along the creature’s flesh, slowly decaying the creature. At the start of a withered creature’s turn, it takes 1d4 Necrotic damage per stack of withering. A creature can suffer from at most 6 stacks of withering at once. Withering can be cured by a 3th level or higher evocation spell.