Thunderwhip

As part of the action used to cast this spell, you must make a melee attack with a whip against one creature within the spell's range, otherwise the spell fails.  You must have proficiency with the whip to cast this spell.  On a hit, the creature suffers the attack's normal effects and must succeed on a Constitution saving throw or take 1d8 thunder damage and be deafened until the beginning of your next turn.

This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).