Burning Strike

You strike at a creature with your limb ablaze. Make a melee spell attack against the target. On a hit, the target takes 1d10 fire damage, and takes fire damage equal to your spellcasting ability modifier at the start of each of its turns until the spell ends. If the target or a creature within 5 feet of it uses an action to put out the flames, or if some other effect douses the flames (such as the target being submerged in water), the spell ends.

The spell's damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10). The secondary damage increases to 1d4 + your spellcasting ability modifier at 5th level, 1d8 + your spellcasting ability modifier at 11th level, and 1d12 + your spellcasting ability modifier at 17the level.