Bone Break

With a power moving through your arm to the enemy the user breaks an enemies chosen bone on touch dealing 1d8 physical damage and depending on which bone was broken the enemy gets disadvantage on certain things

Arm - the enemy gets disadvantage on handheld attacks

Leg - the enemy has half movement speed

Both Arms - enemy has disadvantage and on a failed role the enemy takes 1d6 physical damage

Both Legs - the enemy is immobile

Other Bone - nothing other than the original damage