Booming Blade

You brandish the weapon used in the spell's casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack's normal effects and then becomes sheathed in booming energy until the start of your next turn. If the target willingly moves 5 feet or more before then, the target takes . 1 D 8 thunder damage, and the spell ends.

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This spell's damage increases when you reach certain levels. At 5th level, the melee attack deals an extra . 1 D 8 thunder damage to the target on a hit, and the damage the target takes for moving increases to . 2 D 8 .Both damage rolls increase by . 1 D 8 at 11th level ( . 2 D 8 and . 3 D 8 )and again at 17th level ( . 3 D 8 and . 4 D 8 ).