Weave Necrosis

3-level Necromancy

Casting Time: 1 bonus action

Range/Area: Self

Components: V, S

Duration: Concentration, up to 1 minute

You pull on the necrotic energy of the outer planes, weaving it into your spells intended to heal. Whenever a spell you cast would cause a creature to regain hit points, it instead loses that many hit points if it is any creature type other than construct or undead. If the target is undead, it regains hit points, rather than losing them.

At higher levels: When you cast this spell using a spell slot of 4th level or higher, its duration increases. Its duration becomes 10 minutes when cast using a 4th-level spell slot, 1 hour when cast using a 5th-level spell slot, 8 hours when cast using a 6th-level spell slot, 24 hours when cast using a 7th-level spell slot, 7 days when cast using an 8th-level spell slot, and until dispelled when cast using a 9th-level spell slot. Additionally, if you cast the spell using a 9th-level spell slot, the spell no longer requires concentration to maintain, and you can end the spell as a bonus action on your turn.