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The reward is in the form of artifacts that can be sold, but you can't place resources, which is also a bug.
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The Demons have Rakathash, the Elves have a hero based on Haarhus, the Necropolis has a Seer Spirit starting on turn 28, which is strange, but any other hero will do. The Empire simply has a level 2 Archmage.
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By the way, have you seen the new loading screen yet?
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Right now, we're working on finalizing the latest update and creating a beta mod to replace some of the creatures.