Spoilers:
The end is against a level 49 guy and provides a pretty cool item (though not overpowered) as a reward. For every level you buy troops that are available, fight the caretaker (who gets more powerful) then move on up. On one later level, believe 5, he opened up with Geyser... nice. You never lose your default units.
To me this seems like an ultra condensed version of the new campaigns. Build your army with what's given and fight according to your leadership and skills. Not that it's a bad thing. But there's a theme running through this here game.
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