And this game is one of the easiest to beat so far you just need to learn all the good strategies like not using a bunch of spell cards if you don't have the mana for it.
The easiest way to beat cave 5 is to use units who have a strong pushback in their attacks like the frost giants dragon riders eyc. and it is also best to have the phenox spell and no boss units and to only send a few units at the beginning because of the fact of all the bombermen so also keep the small meteor for them.
To beat the last level on Epic War 2 just use the elves and instead of using proctectors etc. use the side dragons and especailly the titan units because the lord of hell is weak against melee but practically absorbs all magic attacks.