Backlash

Source: Forgotten Realms Heroes of the Forgotten

4th Level Abjuration (Bard, Sorcerer, Warlock, Wizard)

Casting Time: Reaction Range: 60 feet Components: V Duration: Instantaneous

You ward yourself against destructive energy, reducing the damage taken by 4d6 plus your spellcasting ability modifier. If the triggering damage was from a creature within range, you can force the creature to make a Constitution saving throw. The creature takes 4d6 Force damage on a failed save or half as much damage on a successful one. Using a Higher-Level Spell Slot.
The damage reduction and Force damage from this spell both increase by 1d6 for every spell slot level above 4.