Vengeful Smite

The next time you hit a creature with a melee weapon attack during this spell’s duration, you weapon flares with a bright light, and the attack deals an extra 2d8 radiant damage to the target. Additionally, if you have been attacked by the target in the last round you deal an extra 1d8 necrotic damage on every attack made by you against the target. 

For every level cast above 2nd the damage of the initial smite increases by 1d8. Capped at 5d8. Does not deal an extra 1d8 vs fiends.