Arannis's Shield

An invisible barrier of magical force appears and protects you. The legendary wizard Arannis designed this spell so that compared to shield, it is more technical, requiring more careful focus to successfully use, but in return has the potential to hold up against the strongest of blows. Make a spell attack roll. If the roll is greater than your current AC, the number rolled is your new AC until the start of your next turn, including against the triggering attack. Otherwise, you have a +1 bonus to AC until the start of your next turn, including against the triggering attack. Additionally, you take no damage from magic missile until the start of your next turn.