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Here's some more information about the expansion, specifically about the Barbarians.
1. They have a special ability called "Blood Rage." Each attack they make or receive fills a special meter. The more adrenaline in their blood, the stronger the bonuses they receive to hit points, speed, attack, and so on.
2. It also mentions the Barbarians' cruelty; for example, there is a slave market where troops can be sold for resources.
3. There will also be composite artifacts.
4. And also upgrade options:
- Battle Mages deal more damage when firing, but cannot cast spells.
5. The Barbarians also have war cries.