The strongest castle in Heroes of Might and Magic IV.

I saw how Nature and Barbarian factions fought...
the Barbarians didn't stand a chance... quicksand, Cyclops in a daze (from the fighting), and everything is led by monsters...
I think a similar fate awaits... unless the angels arrive and kill the elementals and the hero, but that's unlikely... because the dragons have a "forgetfulness" ability... =)
although it depends on what magic is available.