Cruel Sun

When an creature, object, or magical force engulfs you darkness and means you harm. You can call forth a miniature divine light at the palm of your hand. With such a light that is so pure and holy it can melt and destroy anything in a 80-foot-radius. any creature in its path must make a Dexterity saving throw. creatures take 6d8+10 fire damage on a failed save, or half as much damage on a successful one. If creature are in a wet place then Cruel Sun does 2d8+5 instead

The divine light spreads around the area. It ignites flammable objects in the area that aren't being worn or carried. If it ignites a flammable object, the object does a +2d4 fire damage while it is on fire. But when it's not on fire it has a permanent -4 damage. If any creature is wearing any heavy or medium armor close within the radius their armor begins to melt and does +1d4 fire damage