Welcome to Blaise End! This is probably the hardest level in the game. First, I recommend sealing yourself off on the lower part of the map. Next, when you "dig out", you'll have to contend with a LOT of wondering heroes. Keep your nerve!
Possess and imp to break into the inner chamber with a second portal. It should increase your monster recruitment rate.
Work up towards the castle fortress in the North, and start to dig at the Gems. Find the "Destroy Walls" spell, and use it as I do to get directly to the dungeon heart. Waste em!
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