Indeed, i engage one at level 8 when doing the red eagle quest. I place several double fire runes as i always do at boss areas. However this didnt help much because this one had frost breath shout (maybe because i was to low level?), dealing damage and exploding the runes. I got rid of the 4 minions however. If i did not had an apocalypse mod spell that freezes after 8 seconds i would not be able to take him out. Ironically i use the spell to try it out since the freezing ray did bonus damage after 8 seconds of continious cast. Also i had the freezing shout that helped once i failed freeze him with the spell because of out of mana. This however i could counter if i just was drinking mana pot in advance. I do not think the spell overpowered because at vanilla it would be easier with staggering - balance magic i use lowers staggering realistically. When kill him i save and reload because i was impressed by the amount of health he had, it should be at least the same as dragons, and i use deadly dragons with expert setting. I suprisingly find out that he could one shot me!!! I had 140 health and do not use armor or alteration armor (i played a dunmer with a passion to master destruction and nothing else until then). I had about 47 destruction when fighting him and perks novice, adept, dual cast, the 3 elemental perks and stagger.
this fight is one of the best i ever had in skyrim, because the way i play, i never die (if i die i delete the character). this is my personal achievement and style to enjoy an RPG.