Disorienting Blow

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell's range, otherwise the spell fails.
On a hit, the target suffers the attack's normal effects, and the sound from the weapon's impact disorients the targeted enemy giving it disadvantage on its next attack roll agasint you before the end of its next turn.
This spell deals thunder damage at higher levels and can affect one extra creature.

At 5th level, the melee attack deals 1d8 thunder damage and a second target of your choice within 5 ft of the first suffers the same status and receives half of this thunder damage. The damage die increases by one again at levels 11 and 17.