Through the brand on your arm, your own blood begins to pour forming a massive arm of swirling blood and eldritch magic, your charisma score is increased by two and your maximum charisma score is increased by 2:
As a bonus action, you may summon the Blood Arm, Taking twice your charisma modifier unpreventable damage. The arm lasts for an hour or until you dismiss it, dissipating when you fall unconscious.
While the arm is out your Eldritch Blasts are enhanced, when you cast the spell, you shoot twice as many blasts, taking your charisma modifier unpreventable damage. When a blast deals damage you regain half as many hit points up to 3/4ths of your maximum.
As a bonus action while the arm is active you may reduce your hit point maximum by your charisma modifier and increase your AC until the end of turn. at dawn roll 1d6 you on a 6 your hit point maximum returns to normal.
The arm also acts as a Melee weapon, dealing 1d8 necrotic damage using your charisma score, on hit you regain hit points equal to the amount of damage dealt.
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