Cinder Spawn

Cinder Corruption: Any creature that starts its turn within 5 ft of the cinder spawn must make a DC 12 Constitution saving throw, on a success the creature is immune to this effect for 24 hours but on a fail the creature feels their flesh itch and burn taking 2d6 fire damage which the cinder spawn heals at the start of each of the affected creatures turns, the creature can repeat the saving throw at the end of its next turns.     

Ash Storm: Once per day as an action the ash spawn can shroud themselves in ash in a 30 ft cone heavily obscuring any creatures view within the radius. This effect lasts for  1 minute and can be dispersed by heavy winds.

Multiattack: The cinder spawn can make two fist attacks or one fist and one flame spirit attack

Fist: melee weapon attack +5 to hit, deals 7(1d8+3) bludgeoning plus 6(1d8+3) fire damage 

Flame Spirit: Ranged spell attack +5 to hit, deals 7(2d6+3) fire damage.