Thor’s Hammer

You brandish the weapon used in the spell’s casting and strike a creature within 5 feet. On a successful hit, the target takes the weapon’s usual damage and becomes surrounded by energy until your next turn begins. If the target moves 5 feet or more willingly during this time, it takes 1d8 thunder damage, ending the spell.

The spell’s damage scales with your level. At 5th level, the melee attack inflicts an extra 1d8 thunder damage, and the movement-triggered damage rises to 2d8. Both damage values increase by 1d8 at 11th level (to 2d8 and 3d8) and at 17th level (to 3d8 and 4d8).