Blood Bound

Having experienced the Abyss and survived, you have allowed it to change your body and have gained the following abilities that allow you to siphon vital energy from blood before it disperses, you gain the following benefits:

You can only regain health by finishing a short or long rest, using a healer's kit, or by touching fresh blood that has not left a creature’s body for more than 6 seconds (one turn). A deceased creature’s blood is still considered fresh for 6 seconds after death. Your own blood will not heal you.

• Once per turn, after dealing damage to a creature within 5 feet of you with a weapon that deals slashing or piercing damage, you regain a number of hit points equal to your Constitution modifier (minimum 1). This ability does not work if the creature does not have blood.
• As a bonus action, you can cover a wound on your body with at least 4 ounces of fresh blood located on or within an accessible object within 5 feet of you, regaining a number of hit points equal to 1d6 + double your Constitution modifier (minimum 1). You may use your action to use this ability instead, regaining an additional 1d6 hit points. 
• If you are covered in fresh blood by an external source or douse yourself in a large quantity of fresh blood, you regain 1d6 hit points for every 4 ounces covering your body, up to 20d6 hit points.