A willing target is possessed by a devil of CR equal to 2x the spell level used. The possession lasts until dawn the next day. The devil uses its stats and own HPs. If the devil is reduced to 0 HP, it reverts back to the host's normal form. Any damage in excess is taken by the host.
A possessed being has control of the possession so long as the actions do not contradict the normal behavior of the devil summoned (subject to the DM). Before the spell expires, the possessed may attempt to expel the devil with a WIS save DC of 11 + the spell level used to summon the devil. You have an advantage on this save if your wisdom is higher than the devil's. Success and you take the devil's CR x d4 psychic damage (CON save at same DC to halve). Failure and the devil remains. You can attempt to expel once per round and only three times before the change lasts until dawn and you are under the control of the DM.
Regardless of how the devil leaves, you take one level of exhaustion.
* - (sulfur, ash, or blood)
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