Chaos bed Vestiges

a fiery disc appears in your hand, it can throw it in a straight line 5 feet wide, all creatures that the line crosses must make a dexterity saving throw or take 5d4 points of fire damage, plus choose where the disc stops and explodes, all creatures in the blast zone must make a dexterity saving throw or take 8d8 fire damage.

The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the damage of the explosion increases by 1d8 for each slot level above 7rd.