This video will show you how to beat the first epic battle. If you get confused, you can read the guide below.
GUIDE:
Ok, first, you want to be at least level 19. If you need help getting there, look at my other youtube video showing how to get glowing frames early. You will want max low level gems, starting mana, and mana gain, and at least 3 in armor. My stats are shown at :26. You'll want to start off by putting 2 towers near the gate at the U-shaped trench. This will be where your main force will be, so this will help a lot. You'll want to level up your mana pool a lot at first so that you will gain mana faster per kill. Then once you get it in the 3000's, you'll want to start making good gems. NEVER, i repeat, NEVER make level 1, 2, or 3 gems, because they are too weak, and will no matter what deal no damage to the epic boss, and the 2nd to last wave, which would make the epic boss IMPOSSIBLE!!! Keep making towers and level 4/5 gems, and make sure you get at least 1 purple gem. This is the key to defeating the epic boss. Without this, it would be near impossible. Once you make the formation at 4:03 on, you will want to put your purple in the top middle, so it gets the most hits in on the epic boss. Once you get around wave 20, if you have no mana, you should start saving up your mana and only buy stuff like trenches or towers + level 4 gems once your mana is full. Once you get to the boss, you should have something that looks like my setup at 7:01. You should have the purple gem in the top middle so it will hit the most, and when the boss moves it out of range, you should move the purple gem to the next tower. If done correctly, you should kill it on the second time around, but if it gets past your defences, take all your advanced gems and bomb the crap out of it. If you failed, try again and hope for better gems.