Corona Strike

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell's range, otherwise the spell fails.
On a hit, the target suffers the attack's normal effects, and it becomes enveloped in a brilliant corona of energy until the end of it's next turn. If the target does not move away from you before then, it immediately takes 1d8 radiant damage, after taking the damage, the spell ends.

At 5th level, the melee attack deals an extra 1d8 radiant damage to the target, and the damage the target takes for moving increases to 2d8. Both of the damage rolls increase by 1d8 at 11th level and 17th level.