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With any castle, any hero (main) becomes dangerous with the Bone Raise skill, and that's a fact!
Even starting with Gosh, you can become very strong (much depends on the first week's events), and suggesting to start with a random Necropolis hero won't significantly increase the number of reports about his participation!!!
Maybe this castle should have fewer and weaker heroes?
Gosh - can't be promoted to level 131 (or is it 121?) in the folders (only a few battles, max).
Tant - well, he's not a strong hero.
If Necropolis didn't have Earth and Air magic available for upgrading, maybe that would lower its rank among the strong castles (a joke with a grain of truth).
A mandatory condition is that the opponent's Necropolis has a strong castle (Conflux/Rampart/Dungeon) - but this is already the case.
'The possibility of Necropolis playing against Necropolis?'