Blood Mage

At some point in your families timeline they dabbled into changing their arcane abilities and one of them bore fruit they were able to split their own blood with a powerful demon turning their blood into magic. This magic change to your blood has been passed down through your family making you have a stronger then normal tie to arcane arts literally through your blood.

Blood Magic

You can harness the magic energies emanating from your blood line, when you cast a spell of level 1 or higher you may pay health instead of using a spell slot. The cost is your level plus the level of the spell you want to cast. Spells cast this way do not require material components unless the components are consumed on use. You can use this feature a number of times equal to your proficiency and you regain all uses of this feature when you complete a long rest.

Tainted Blood

You're blood has become so tainted that it effects the targets of your spells. When you hit with a ranged spell attack with a leveled spell the target(s) must make a charisma saving throw or become charmed by you. They may repeat this save at the end of each of their turns. A successful save renders them immune to this effect for 24 hours.

Blood Warrior

You have gained the ability to use your blood for more then just spells, You can cause your blood so solidify and become a warrior of blood. As an action you can harden your blood to form armor and weapons, while not wearing armor you gain AC equal to your charisma modifier and you create a finesse weapon made out of your blood; this lasts 1 hour. While wielding your blood weapon it counts as your spell casting focus. You can use this feature a number of times equal to your proficiency modifier and gain all uses after you complete a long rest.  

At level 12 when taking the attack action with your blood weapon you may make a second attack with this weapon.

Unstable Explosion

Your blood had become very unstable, when you reduced to 0 Health your blood explodes in a AOE around you. All other characters within 30 ft of you must make constitution saving throw or take 8d10 necrotic damage or half as much on a success. You can use this feature once per encounter.

Demonic Form

You have been blessed or cursed by your bloodline which it is, is determined by you. Once per long rest as an action you can tap into the Demonic blood inside you and transform into a living embodiment of your demonic blood, transforming into Pit Fiend. This transformation lasts for 1 hour or until you are reduced to 0 HP.