Hey I just read through this, and thank you Mac_MK for putting that strategy for the first epic boss on here. Just so every one knows, the strategy guide is very good, and the strategy I gave to Mac_MK is a hybrid of the guide for that one level made by me using information from the guide and my own experience.
I agree with Ralphocop, always reset your skills, and usually max out the skills that you think you would use the most. About the dual gems, like Ralphocop said, when you get the dual mastery spell, dual gems kick some serious butt because when you max it out, the speed is way up there and if you combine high level gems with lvl 1 gems AND the dual mastery spell is in effect, you have a high damaging, rapid fire gem. It's that awesome.
Plus, if you plan to use manapool, use it early or you wont get much out of it. And if any one wants help, ask on my profile. If I'm past that point I will help (right now I'm just past the second epic boss, I don't have trouble, I'm just only spending about half an hour on it every day)
Good Luck!