Booming Blade

Melee attack: On a hit, the target suffers the
attack's normal effects, and it becomes sheathed
in booming energy until the start of your next
turn. If the target willingly moves before then, it
immediately takes 1d8 thunder damage, and the
spell ends. At 5th level, the melee attack deals an
extra 1d8 thunder damage to the target, and the
damage the target takes for moving increases to
2d8. Both damage rolls increase by 1d8 at 11th
level and 17th level