A challenge to survive ...
This skirmish based level is intended to be a challenging fight.
Your dungeon is pre-built with plenty of gold and a gems immediately
available.  Finish the rooms and the elite creatures will join 
your service.  Search the dungeon for magic items
and mana vaults ... for without them you are unlikely to survive.

But beware, the heros know where you are and are coming to get 
you.  To make your life miserable and short, there is also another 
keeper in this realm.  And he also boasts of his legion of elite 
creatures.  You will need all your skills to survive this situation.

Once the legions of heros attacking you are defeated, take the
Hall of Princes from its defenders and head through the labrynth to
the dispair of the King and his pet keeper.

When starting the game, 2 enemy keepers should be selected.  The 
first keeper selected will handle the elite legions against you.
The second keeper is under the thumb of the King (and so the
keeper type selected is irrelevant).  Good luck!