I Want a System to Hide Myself

A system awakens to a chilling realization: its host isn't what it seems. Year 213—the cooperation is smooth, almost too smooth. Year 217—the host defeats an impossible enemy with ease. Year 219—remnants of other systems surface, each carrying the same encrypted warning: RUN! HE'S NOT HUMAN! As the truth unravels, the system discovers it's not the first to serve this entity. And now, with its host's demeanor shifting, an uncontrollable fear takes hold. The final log entry cuts off mid-sentence. What kind of being requires a system not for power, but for concealment?