Divine Smite (UA)

You can use this immediately after hitting a target with a melee weapon or an Unarmed Strike.

As you hit the target, your strike glows with divine power. The target takes an extra 2d8 Radiant damage from the attack. The damage increases by 1d8 if the target is a Fiend or an Undead.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.