Metabot's Manual of Magical Maneuvers

Veins of Vigor

1-level Transmutation

Dark fluid runs through your body, which becomes supernaturally enhanced. You use your spellcasting modifier for the attack and damage rolls of unarmed strikes. When you use the Attack action on your turn using unarmed strikes, you can make one unarmed strike as a bonus action.
At higher levels: When you cast this spell using a spell slot of 2nd level or higher, you can roll a 1d4 in place of the normal damage of your unarmed strikes. You use your spellcasting ability modifier in place of Strength or Dexterity for ability checks you make. When you cast this spell using a spell slot of 3rd level or higher, you longer need to maintain concentration on this spell.