Officium

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An officium is a headmate who is essential to the system’s functions for some reason. The system's way of functioning would be heavily effected if they were to go dormant, fuse, or similar.

Related Terms
Officium can be used alongside any other role(s), such as an autopilot or dvalen; it can also be used as a standalone role. They may also be in a position of authority within the system.