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The manual (it's in the fun documents folder, along with the skill wheel) contains a lot of useful information about the mechanics. Bees push back a stack by 0.6 attack points, the frequency of the hive's moves depends on the hero's spell power, and the hive's initiative is 10 + 0.25 * spell power. The hive's initiative should be noticeably higher than the initiative of the stack it will be holding, and you also need to remember about mana.