Blood and bone make blade
Level 3
Bloodblades.
When using Open Vein’s damage bonus, your unarmed attacks become 3d4 + STR and deal slashing damage.
Level 7
Bestial Transformation.
When you choose Open Vein's damage bonus at the start of your turn, you may choose to transform. While transformed, your Bloodblades' damage is 3d6 + STR, and you cannot use Defend. You stay transformed until you reach 0 HP or the encounter ends.
Rending Claws.
Your unarmed attacks deal +10 damage to armored foes.
Level 11
Bestial Transformation (2).
Your transformations attack is now 3d8 + STR.
Feeding Frenzy.
When you hit a Branded foe with an unarmed attack, heal INT HP.
Level 15
Feral Agility.
(1/turn) 0 Actions: Make an unarmed attack. This is not subject to disadvantage imposed by Rushed Attacks.