Chain shot

You conjure a Minigun with Mana and conjure bullets. Roll 2 d20, one for Damage the other for if you can fire again. If you manage to roll a 5 or higher you shoot a second bullet dealing the same amount of damage as the first and you roll again and the number you must get increases the longer the chain (Caps at 20). If you fail to reach the roll requirement than your chain falls to 0 and your action is ended.