eluvians:

Flame Atronachs are the weakest and most common atronachs encountered. Constructed entirely of fire, Flame Atronachs resemble humanoid females wearing black metal armor. They possess horns, pointed ears, three fingers, and two toes. Flame Atronachs float above the ground at all times and when moving they leave a trail of fire behind. When idle they often do spins and back flips. Unlike other Atronachs, Flame Atronachs rely on speed, agility, and powerful ranged attacks to dispatch their foes.