Balagos's Fire Spin

A Ring of flames engulfs a creature doing 1d10 fire damage, over the next few turns (equal to your spell modifier) the creature engulfed in flames will take 1d4 damage per turn until the effect wears off. If the target is already burned the damage die becomes 1d6 per turn.

The burn damage increases by 1d4 at 5th level (2d4), 11th level (3d4), and 17th level (4d4).