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The main mistake is choosing Shackaruk, as this hero claims the title of the worst on large maps. This is because wyverns already have a lot of health (they are a 6th-level unit), and the bonus turns out to be extremely small.
Also, there seems to be one skill in the education tree that increases the gain or loss of rage by 1.5 times. This skill most likely doesn't work correctly, as the rage loss is simply insane.
