Dark Soul

5th-level conjuration

Casting Time: 1 action

Range: Self

Components: V, S, M (a small fiendish idol)

Duration: 1 minute

Calling out for aid, you offer your body to be a conduit for a fiend to release its fury. For the duration, you gain 2d4 to your Strength, Dexterity, and Constitution scores for the duration of the spell, and you deal 1d8 magical bludgeoning with your unarmed strikes, which you are considered to be proficient with. Furthermore, you gain resistance to bludgeoning, piercing and slashing from nonmagical weapons.

At the end of each of your turns, you must make a Charisma saving throw, the DC of which varying depending on the willpower of the fiend you have called into yourself. Roll 1d6-1 and add the result to the base DC of 10. This is the DC of the saving throw for the duration of the spell. If you fail your saving throw, the fiend takes control of your body for the remainder of the duration, which you cannot choose to end prematurely, and wreaks as much havoc as possible. The fiend can use your skills, feats, and abilities as normal, but has no access to cast your spells.