“Thick, black hair grew around the scar, my blood was on fire, it was… intoxicating”
Transform! When you take damage, you can spend a Hit Dice to enter WereForm.
WereForm. Add 1d8 to your melee attacks. You have DisAdv on all INT based Skill check. When take damage: lose a hit dice, if you don’t have any then ”Can’t… control!”
Your WereForm lasts until you “Can’t… control!” or take a rest.
Can’t… control! You go into a rampage. Roll a number of d8 equal to your highest KEY STAT and deal that much slashing damage to all creatures in reach 2, then drop out of WereForm and are Dazed.

“Juicy!” - Candy, after kissing me on the neck
Fangs. (1/turn) Action: Deal KEYd4 piercing damage, cannot crit. On hit: if the creature can bleed, Feed!
Feed! Spend a Hit Dice to keep one of the die from the Fangs attack, with its rolled value. This is a Blood die. You can always replace it if you feed again.
Juice Supply. Action: Action: Before you make a skill check or a save, you can reduce the Blood die value by 1 to gain advantage. When you don’t have a Blood die, you make all checks and saves with disadvantage.
When you take a long rest, reduce the value on the die by 1.
”Animal blood is not that nurturing, also is celestial/fiendish blood good? Who knows? Give it a try!”