Branding Smite

Casting time: 1 bonus action.
Range: Self
Duration: Concentration. Up to 1 minute
The next time you hit a creature with a weapon
attack before this spell ends, the weapon deals an
extra 2d6 radiant damage to the target, which
becomes visible if its invisible and sheds dim
light in a 5-ft. radius and can't become invisible
until the spell ends.
At higher levels: the extra damage increases by
1d6 for each spell slot above 2nd.