I beat the last epic lvl (with a glowing frame i might add) and it really wasn't that bad. He has 146k hp and 120 armor. I suggest lining up the way with grade 6 or better gems on both sides and trenching the path in between. No higher than grade 8 gems as they are expensive and are a waste when instead you can have two grade 7s that together do more damage. I also suggest using cyan and purple gems as much as you can. It's also helpful to have a high grade green gem. Then if you beat the other epic bosses, you know that it is nearly impossible to beat them on the first lap. So, mana pool up regularly through the level and get to around 12k of mana. On his last lap, make sure to bomb his face as he nears your house. As far as skills go, you want to fix pure gem mastery, high grade starters, initial mana, gem combining, and lvl up about half way on gem bombs and structures. I beat him on his second lap and he had one more to go doing this.
-- Spoiler Alert--
Your guy gets corrupted at the end by the thing that corrupted the dark wizard and in the next chapter you have to save your old character.
Chapter 2: Chasing Shadows