Nightmare CoF under 15 minutes!

Things to do before starting a battle:
1. Prepare a main team (the one that you will be using to clear most of the stages.), for my case is Hyral, Eva, Lokz, Lucia, Awakened Abyss.
2. Charge up Lokz, Eva and Abyss (important!), try to use those who doesn't deal much damage and able to heal like Lucas or Vincent. The reason why I used Hyral is because he can charge up allies' power too, his aura also helps Abyss to solo the enemies on her own.
3. Once you charge up the 3 heroes (or more if you can), charge up more heroes in case of an emergency where one of your heroes died along the way. For my case, I will charge up 2 magic based heroes every wave (preferably those who stand BEHIND Abyss).
4. The more heroes you charge, the higher the rate of winning. Luckily for me, my enemies aren't that difficult, except for that final stage.

Things to take note:
1. Make sure you drag the battle for as long as possible, this is to make sure everyone charges up fully before the battle ends. Just don't drag until time's up.
2. Magic heroes are preferred, this is because Magic attacks NEVER miss. Also, Abyss alone is able to deal huge damage to the enemy.
3. Don't hesitate to hire heroes from the guild if you really need them, they are there for a reason!