Arcane Decimation

You hurl all of your magical power into one attack at an object or creature in range. Make a ranged attack roll against the target. On a hit, the target takes 10d20+WIS force damage. The target cannot cast spells for the next 2 turns. Additionally, the target of the spell is knocked prone, and you cannot cast any spells over level 1 for the next 2 hours or until you take a long rest.