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Perhaps, before a battle, we could choose the form of the Spinners in the army slot? Although, most likely, they will transform during the battle. We will probably only be able to recruit the initial form, but the final form should remain after the battle. But that depends on how the developers implement it. However, I think it would be illogical if, at the end of the battle, we had a Sorceress, and then they immediately transformed into multi-armed spider creatures.