As enforcer says there are pieces that help. I did it first time, but then again may have been level that helped me. Also what may have done it is I had one one +40% HP, one +40 defence, one +1 fire sphere (that maxed out my skill there ) and I think the others were +mana and +burst.
Basically I just targeted zagon and sphered/breath/burst(when crowded) having taken out one of the nests and he seemed to collapse not too badly and after not too long.
Hope this helps guys, as said may have helped I was at least mid 20s when I did this both complete runs so far
