AlekseyS
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Demons are very tough; defeating all three and also breaking through the garrisons... of course, they move before the hero. I also have an elven army, which, as I understand, I won't be able to replenish further. I restored Ashen, I'll try to defend there, but I'll probably have to revert to saves before the portal.
Don't rush to the demons. It's better to visit the leveling locations on the surface, buy spells, increase your army, etc.
Added after 49 seconds
I've almost reached the buttons. But no matter how much I rotate the map, I can only see one! Or are they all different shapes?
They are cleverly hidden :D. They are all the same.