Ashbolt

Conjuring a burning ball of ash, smoke, and embers into your hand, you hurl it at your target, setting them alight. Make a ranged spell attack against the target. On a hit, the target takes 1d8 fire damage. Any flammable object hit by this spell ignites, causing 1d4 fire damage to anyone holding or wearing such an object until they use a bonus action to snuff the flames.

Both this spell's base damage, and additional on-fire damage, increase by 1d8 and 1d4 respectively, when you reach 5th level (2d8 base, 2d4 on-fire), 11th level (3d8 base, 3d4 on-fire), and 17th level (4d8 base, 4d4 on-fire).