Calidarius' Ember v2

You sling a crackling ball of fire at a creature or object within range. Make a ranged spell attack against the target. On a hit, the target takes 1d10 fire damage. A flammable object hit by this spell ignites if it isn't being worn or carried unless the target fails a DC12 Dex Save. A target lit aflame will take 5 fire damage at the start of their turn. The target or its ally can use an action to douse the flame.

This spell's damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).

Regardless of your spell casting ability, your Attack bonus with this spell Attack equals your Dexterity modifier + your Proficiency Bonus.