Brilliant Blade

As part of the action used to cast this spell, you must make a melee attack with a weapon or unarmed strike against one creature within reach, otherwise the spell fails. On a hit, the target suffers the attack's normal effects, and it becomes sheathed in dim light until the end of your next turn. The target then cannot hide or become invisible until the spell ends. If the target willingly makes a melee attack with a weapon or an unarmed strike , it immediately takes 1d8 radiant damage, and the spell ends.

This spell's damage increases when you reach certain levels. At 5th level, the melee attack deals an extra 1d8 radiant damage to the target on a hit, and the damage the target takes for making a melee weapon attack or unarmed strike increases to 2d8. Both damage rolls increase by 1d8 at 11th level (2d8 and 3d8) and again at 17th level (3d8 and 4d8).