Devil Tails

You command your body to change in Dark Speech and it listens. 1 tail per caster lvl (max of 10), formed of your own blood and viscera, burst forth from your lower back, dealing 1d6 points of piercing damage per tail to yourself. As a bonus action all of the tails can be used to attack, dealing 1d6 and half of your Strength modifier points of bludgeoning or piercing damage per tail. Each tail has a Strength and Dexterity value of 13 and are each treated as separate entities for the purposes of ability checks. If a tail is severed, the caster must make a Concentration check to have it re-attach itself. On a failed save, the caster will suffer from blood loss and will gain a half of point of exhaustion per tail lost in this fashion.