Ple-Sen
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Similar mechanics existed in King's Bounty and in the fourth installment, but firstly, there should be no option to buy them back, and secondly, they should follow specific routes (otherwise, it will be frustrating when a player's hero leaves the castle and is immediately eaten... or, for example, a hero with reinforcements, or a city is captured). But essentially, such a hero would not differ much from a computer-controlled player, except for the absence of a city.