What order to progress through Areas?

[YENKO]

Also, the overall difficulty depends largely on your hero 'setup'. At one time, there might be lots of 'strong' enemy armies which are indeed nasty, and the next minute you find an excellent spell or artifact, or a new unit type, and right now, that 'strong' unit is not so hard anymore. Right now, i learned that, with my setup, those 'match' enemy armies are not match at all, since i can beat them with zero losses. Yes it involves lots of tinkering with mana, rage, chargers, mana spring and resurrections, but still.. Yesterday i liberated that Castle Bogacho, and that was a very vicious battle for me. Killed the Mega-spider too. Kraken is still alive, and i am planning to have some fun with him later with kickass units and hi-lvl hero