Mummy's Fist (Spell)

Mummy's Fist is a 4th level Necromancy spell. Make a Melee Spell Attack to deal 5d10 Necrotic damage and force a CON Save. On a fail, the target is cursed and can not heal. Its Max Hit Points will also reduce every day. unless it is removed
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==Description==
You wreathe your fist in accursed wrappings of the dead and make a Melee Spell Attack against a target within range. On a successful hit, the target takes 5d10 Necrotic damage. If the target is a creature, it must also succeed on a Constitution Saving Throw or be cursed with Mummy Rot. The cursed target can't regain Hit Points, and its Hit Point Maximum is decreases by 10 (3d6) for every 24 Hours that elapse. If the curse reduces the target's Hit Point Maximum to 0, the target dies and its body dissipates into ash. The curse lasts until removed by the Remove Curse spell, or by other Magical Means.