Rafael’s Wailing Curse

Casting time: 1 action — Range: Touch
Components: S — Duration: 1 minute
You deliver a magical bite into your target that
exposes their weaknesses. The target gains
disadvantage on its next saving throw. After
the roll the spell ends.
At 5th level, any damage it receives from failing
the saving throw is increased by 1d6. At 11th
level the damage increases to 2d6. At 17th
level if the target would gain hit points it loses
that many hit points instead and the spell ends.