to beat the last level u have to have all things upgraded. For the first half of the battle all you should need is arrows (maybe a few dwarfs if you miss a small guy) then when you have full mana and all the other things (trap, cannon, and barrior) start sending arch angles, dragons, mages, and golems. then when the boss comes just send angles, dragons AND make sure you are sending elves and hobbits NONSTOP to make sure he is barely moving. also makesure your firing arrows. If you do this right he wont even have any damage on your base at the end.
 "Dinowaurs"){kind=icon}
 "Epic war"){kind=icon}