Rock Armor

As a bonus action, when you cast "Magic Stone", other stones in the area magically cling to your skin. They act as medium armor and raise your AC to 14, but will not exceed 14. You are proficient with this armor. This armor lasts for 1 hour or until you dispel it. 

While wearing this armor, you can use your bonus action to make a ranged spell attack to shoot a stone at an enemy you can see. You roll to hit and roll the damage as normal for the spell.