Booming Blade 2024

You swing the weapon used to cast the spell and perform a melee attack against a creature that is within 5 feet of you. If the attack hits, the target takes the weapon’s usual damage. Afterward, it becomes surrounded by unstable, thunderous energy until your next turn begins. Should the target willingly move at least 5 feet before that time, it immediately takes 1d8 thunder damage, and the effect of the spell ends.

At Higher Levels. The damage increases by 1d8 when you reach levels 5 (2d8), 11 (3d8), and 17 (4d8).