Command of the Bloody Tongue

You command the target’s blood to rush out of its wounds.
To cast this spell, you must bite your tongue, inflicting 1
point of damage on yourself. The target must succeed on a
Constitution saving throw or become susceptible to bleeding for the duration. Whenever the susceptible target takes
damage, it bleeds for the rest of the spell’s duration. While
bleeding, the target loses 5 hit points at the start of each of
its turns. If the target regains hit points in any way, or benefits from a successful Wisdom (Medicine) check against
the spell’s save DC, the bleeding stops until the target is damaged again. Undead and creatures like constructs that
lack blood are unaffected by this spell.
At Higher Levels. When you cast this spell using a spell
slot of 6th level or higher, the target loses an additional 5
hit points each round that it bleeds.

*Thanks to Sandy Petersen’s Cthulhu Mythos, © 2018, Petersen Games