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The AI Warrior has no effect at all. After the first month, they started living their own lives and wouldn't bother me at all, but I got bored.
Also, there's a small bug: If a charge triggers due to specialization, the unit has a chance to also gain combat spirit for that turn. As I understand it, because the Rakshasa's charge consumes a turn, it also tries to consume a turn for the unit, but it doesn't work.