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I believe that when a hero engages a single group of (identical) neutral creatures, it's better to choose Dark units (especially when the neutrals are weak – to avoid a prolonged battle). Regeneration and poison will be useful. However, when a hero engages another hero or a group of different neutral creatures, then Pao-Kai units become more useful. In general, if you have to choose one upgrade out of two, it becomes clear that one is more beneficial with a small number of creatures, while the other is more beneficial with a larger number:smile38: