Abyssal Transformation

You attempt to mold a creature you can see within range into an abyssal being. The target must succeed on a Charisma saving throw or be cursed for the duration. While cursed in this way, the target must repeat this saving throw at the start of each of its turns. If it successfully saves against the spell three times the spell ends. If it fails its save three times it is transformed into a demon until the spell ends. You choose what type of demon it is transformed into, but its challenge rating must be 1/2 or lower.

While transformed in this way, the target acts on its own initiative and under its own control, however, while you are within 60 feet of it, you may use an action on your turn to mentally command it to halt. If you do, it becomes stunned and its movement speed is reduced to 0 until the end of its next turn.

If you concentrate on the spell for its maximum duration, the transformation lasts until it is removed by an effect such as remove curse. If the target dies before the spell becomes permanent, it reverts back to its original form. Effects that prevent or end possession also end or prevent this effect.

If you target a willing demon with this spell, it does not make any saves and is instead instantaneously transformed. The demon decides its new form, choosing from your available options.

At Higher Levels. If you cast this spell using a spell slot of 7th level or higher, The maximum CR of the demon the target transforms into is doubled for each spell level above 6th. The cost of the material components required to cast this spell is also increased by 100 for each level above 5th.