Ника Красногвардейская
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An impassable garrison consists of 999 dragons (immune to dark magic spells) and three groups of 999 archers and elf wizards of two types each. After visiting the Jarl, the garrison does not disappear.
Added 2 minutes later
Yes, and "astral gates" do not appear in the spellbook. Strange questions, just play through the map and you'll see everything for yourself.