Ascendant Protection

When you are hit by a weapon or spell attack, you surround yourself in shimmering radiance, reducing the damage from the attack by 2d6 plus your spellcasting modifier. If you reduce the damage to zero, you call down a barrage of divine energy that deals force damage equal to the damage reduction to all creatures in a 10-foot Cylinder centred on yourself.

Using a Higher-Level Spell Slot. The damage reduction increases by 2d6 for each spell slot level above 2.