You have darkvision (60 feet).
You have resistance to fire damage.
You inherit a warlock cantrip and a level 1 warlock spell of your choice, choosing Intelligence, Wisdom, or Charisma as the spellcasting ability for these spells.
When you gain a feat at levels 4, 8, 12, 16, and 19, you can forgo choosing a feat and gain a Fiendish Feat option of your choice.
You have advantage on Charisma (Intimidation) checks when interacting with humanoid creatures.
You have advantage on Charisma (Deception) checks when interacting with humanoid creatures.
You inherit the charm person spell, using your choice of Intelligence, Wisdom, or Charisma as a spellcasting ability modifier. Moreover, you have proficiency in the Intimidation skill.
Whenever you cast a spell that deals fire damage, you shed bright light out to 10 feet and dim light for an additional 10 feet until the end of your next turn. Any creature that ends its turn within that area takes fire damage equal to your level.
You have resistance to necrotic and poison damage, and advantage on saving throws against the poisoned condition.
You have advantage on Charisma (Persuasion) checks when interacting with humanoid creatures.
The range of your Darkvision feature increases by 60 feet.
You have a flying speed equal to your walking speed, provided you are not encumbered.
You can reroll any 1 on a fire damage die.
You can take the Magic action to transform into an humanoid creature with an equivalent appearance, or back to your normal form.
While you don't have armor equipped, your Armor Class is 13 + your choice of your Strength, Dexterity, or Constitution modifier. You can use a shield and still gain this benefit.
You have your choice of a barbed tail (slashing), goat-like hooves (bludgeoning), horns (piercing), retractable claws (slashing), or sharp teeth (piercing). You can use the chosen option for your unarmed attacks, dealing 1d6 + your Strength modifier of the damage type in parentheses after the option.
You can take the Handle or Help action using your barbed tail.
You have witchsight (60 feet).