You should be able to send waves early and get more xp from it. Gets very boring after u maxed everything and just wait half the lvl. Otherwise nice game but I prefer the epic war series 3/5
To defeat the end:
1. Max all upgrades
2. Max mana
3. Build all kinds of defenses
4. Destroy the caste to initiate him
5. Hold asdf to start spamming arrows
6. Click outside flash screen to keep spamming arrows even when you release asdf.
7. Spam buttons 1 and 7
8. Win
The point behins this is to send hobbits to suck up his attacks (he's not moving when attacking, so attacking = good). The angels are good because they will easily take care of any additional trash spawning behind him, making you able to focus boss only with your arrows. To sum it up:
Hobbits: Cannon fodder
Angels: Trash cleaners
Arrows: Your winning formula
Really nice game, although it gets very monotonic towards the end. You should consider making lots more upgrades in the research tree, making them cost less, and making the the levels towards the end harder to outbalance it.
Olive08: The best so r: means u completed 5 levels. The boss is on the 6th level. The secret way to complete it is to get 5 stars in each level before the epic one and unlock a secret level. Completing that one will also earn you the achievement.