Talons of the raven

Upon casted, the casters hands shift into raven talons, the talons are razor sharp and very dangerous, the talons are strong enough to break the toughest stones, (unarmed strike becomes a form of Claw, grab, or the talons get jabbed into the opponent) (to dodge this attack the opponent must succeed a Dex 16 saving through) (the talons shift back when the caster dispells the spell) ( the damage of the attack are decided by 3d8+4)