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First, check the list of tasks – all the main ones, except for the last one, should be marked with a checkmark.
If you replay, you don't need to split the cyclops. Immediately attack with Goth, and to increase the effectiveness of the "Wrath of the Horde" spell, transfer the goblins and centaurs to him.
And what does "teleport doesn't open" mean? Have you tried entering the portal at the Elven castle?
