The next time you hit a creature with a melee weapon attack before this spell ends, your weapon is surrounded by a shimmering aura of antimagic, and the attack deals an extra 3d8 force damage to the target. Additionally, if the target is concentrating on a spell of 3rd level or lower, the creature’s spell ends. If it is concentrating on a spell of a higher level, it has disadvantage on the Constitution saving throw it makes to maintain concentration on the spell caused by taking damage from the attack. Either way, this spell then ends.