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Machine spirit
From Warhammer 40k - Lexicanum
The Machine Spirit is an extraordinary combination of organic and mechanical components within a vehicle that helps to control its movement and weapons systems. Should the crew of the vehicle be, for whatever reason, incapacitated, the Machine Spirit is able to take control, thus allowing the vehicle and weaponry to function without any pilots (providing the systems themselves are still functional). The Machine Spirit is however, less capable than its true pilots.