You must have made a pact with a Fiend, undergone an infernal ritual, or have some other plausible reason to have become a Fiend. Discuss with your GM how you can achieve this in-game.
Some of your abilities require your target to make a saving throw to resist their effects. The saving throw DC is calculated as follows:
Transformation Save DC = 8 + your proficiency bonus + your Charisma modifier
Transformation Boon (fiendish form). Your Charisma score increases by 2 and your Intelligence score increases by 1. An ability score cannot be increased beyond 16 this way. You become a Fiend in addition to any other creature types you are. Spells and abilities that affect Fiends of a specific CR have no effect on you.
Transformation Boon (brand of the tyrant’s hellfire). As a bonus action on your turn, you can brand a creature within 60 feet of you with a fiery mark that exudes hellfire. The target must make a Charisma saving throw, and on a failed save they are branded. Whenever you hit a creature branded in this way with an attack, you deal an additional 1d6 fire damage.
A creature remains branded for 1 minute. The brand disappears if the creature is knocked unconscious, enters hallowed ground, or is targeted by the remove curse spell. You may use this feature a number of times equal to your Charisma modifier (minimum of 1). You regain all uses of this feature when you finish a long rest.
Transformation Flaw (planar binding). Your body and soul are bound to a fiendish plane of existence. You have disadvantage on death saving throws as the plane attempts to pull you back to it. If you would be killed, your soul has been dragged back to a plane of existence of the GM’s choice. This plane is your new home, and you become an NPC under the GM’s control.
If you are on the fiendish plane responsible for your transformation, this flaw has no effect.
Transformation Flaw (hideous appearance). Your appearance has grotesquely transformed. Your skin becomes red and leathery, and vicious horns, teeth and nails erupt through the surface of your skin. You can suppress this form and present the appearance of the humanoid you once were, but this is taxing and requires concentration. Moments of stress are likely
to reveal your true nature. In the following situations your true form is revealed:
- Concentrating on a spell.
- Gaining the unconscious condition.
- Entering hallowed ground.
- Choosing to reveal yourself.
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