Vengeful Sin

You Infuse your weapon used in the spell's casting with crackling energy and make a melee attack with it against one creature within reach of you. On a hit, the target suffers the weapon's damage and takes 1d10 radiant damage and then a curse is placed upon them that lasts until the start of your next turn. If the target damages you during this time, they take radiant damage equal to your spellcasting ability modifier. 

 At Higher Levels. At 5th level, the melee attack deals an extra 1d10 radiant to the target on hit and the damage taken from the curse increases to double your spell casting focus. At level 11th (3d10 + triple spellcasting ability modifier) and at level 17th (4d10 and quad spellcasting ability modifier)