Bloodpact

You control your magic through the pulsing vitae of your lifeblood sacrificed for power from your patron. 

Vitae

You use Constitution instead of Charisma for your Pact Magic spellcasting.

If you're holding or wielding a weapon that deals piercing or slashing damage, as a bonus action you may take damage as if hit with your own piercing or slashing weapon (do not add your ability modifier to this damage), to empower your spells with your own blood. For the remainder of the round you gain advantage on all attack rolls; and creatures who you force to make a saving throw do so at disadvantage. You may use this ability a number of times equal to your Proficiency bonus plus your Constitution modifier. You regain all uses after a long rest.

Coagulated Armor

You can cast Mage Armor at will as a reaction. Whenever you cast Mage Armor, you gain an additional +3 AC for the duration at the cost of taking damage as if you used your Vitae ability.

Sacred Vitae

Whenever you use your Vitae ability and take damage, you gain temporary hit points equal to that damage you took. 

Steal Vitae

When you use your Vitae ability, if you dealt piercing or slashing damage to a creature within 5ft during your last action, you deal only minimum damage to yourself with it but gain the maximum amount of temporary hit points possible from your Sacred Vitae ability. 

Blood Blast

Add Constitution Modifier to your damage from Eldritch Blast while you are missing any HP.