Cortex Ruination (Hemomancy*)

As you plunge the sacrificial dagger into yourself and chant a small curse, the blood that oozes from your form begins to coalesce around you. Once you have selected your target, the blood rushes forward towards your target and begins to assault their Temporal Cortex, or amygdala, and attempt to seize control of a medium humanoid, fiend, undead, fey, or celestial with less than 200 hit points within range. The target must make an Intelligence saving throw, on a success the target takes 5d10 necrotic damage and does not lose control of themselves. On a failure, the target creature's soul leaves the body temporarily and your soul moves in. You gain all physical and racial abilities as well as memories of the creature. When you take over the creature, you gain their stat block and you body becomes an empty husk which will remain available for your soul to return to after the spell ends.

The body does not appear to the common eye that you are occupying it, someone can attempt to see the signs of your Hemomantic takeover if they roll a successful Wisdom (Insight) or Intelligence (Investigation) check against your Intelligence score plus your proficiency bonus.

When the spell ends or the body dies during the spell, your soul will attempt to leave on the vessel you arrived in, the blood. If your body is not within 90 ft of you when this occurs, your soul becomes lost and you die. Once your soul leaves the body and the body is still intact or considered alive, the original soul will return to it and become hostile towards you.

*Racial: This also includes abilities such as the Dragonborn's Breath weapon or a class ability such as Divine Sense.

*Hemomancy- This spell is gated by the treacherous rituals and practices of Hemomancy, a specific branch of Necromancy. You may not take this spell as a level option and must speak with the DM about having access to this kind of magic or receive it as a gift or find this spell during the game.