Demonic Bloodline

You're descended from a long dead demon, but you still got the gift of his power, and are able to make deals in souls.

Demonic Boons

You have an perpetual, ear-to-ear, off-putting, yellow-toothed smile on your face, and your eyes dance around their soul like daggers. You have +2 on intimidation if they can see your face, and +1 on persuasion and deception checks. You barely bleed, even when badly injured. Your face was made for radio. - The image from divination spells on you is heavily distorted, and exactly what you do can't clearly be seen, but your voice is heard loud and clear.

You can make a soul binding magical deal that both willing parties have to obey. (Both parties must have at least 8 intelligence to make a deal.) Only a wish spell can break a deal, or if you fully die, all deals are voided after 4d4 months. You can own creature's Souls with this by direct means, by proxy, or by conditionals.

You have 10ft of true sight.

(Here are the links for Shadows and Shadow Demons because it wouldn't let me share Souls if they were on the page.)

Dealmaker's Gift

Now when you get a soul from a deal, you get +10 feet of movement, all -1 sorcery point ability cost (unless that'd make it 0), and +1 on all attack rolls for 24 hours. (Stacks 3 times.)

You have 30ft of true sight.

(Check to see what new things you can do with Souls at 6th level.)

Shadow Morph

You can turn into a shadow for 3 sorcery points with a BA on your turn, making your movement speed double your current speed, freely moving along any surface, and reforming into yourself once you stop moving. You can only go through walls up to 1ft thick.

Shadow Horns

Use your BA or A to get 1 level of shadow horns: +1 size and your eyes pierce the soul of whoever looks at you (+3 intimidation). It can be active for 18s/day. ±1 intimidation for every size larger or smaller you are than the target. You lose 6 seconds at the end of your turn for every level you have active at once.

When this ability is active, you can cast Psychic Intimidation at will for 1A without using a spell slot, even if you don't know the spell or don't have it prepared.

Demon's Virtue

You have a legendary action, and while not in combat, it can be used on your turn. It takes 2 turns to regenerate, and does so twice per day. If you use shadow morph this way, are on a 1/4th of your maximum health, and in combat, you get 300 feet of movement and are forced to retreat.

You have resistance to non-magical melee attacks, and immune to power word spells.

You have access to your own special spell: Cripple. It is always prepared.

You have become a master of magic, and can mold it into anything you like. You can expend a reasonable level spell slot (and/or sorcerer points) to create any magical effect. "Reasonable" and the full extent of this ability are decided by your dungeon master. (Remember, they get the final say on everything.)

You have 60ft of true sight.