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The Overmind is a colossal and brain-like Zerg entity of an indeterminate age and level of alien intelligence, which within the original Starcraft storyline stated to have "borne witness to the passing of countless millennia".
The Overmind's plan was partially successful; it had infested a Terran by the name of Sarah Kerrigan, augmenting her already powerful latent psionic powers and turning her into a powerful servant.
The Overmind, already in a state of psychic shock due to the assassination of two of its cerebrates by the Dark Templar, Zeratul, was helpless.
The Overmind is the highest of these ranges : it is full of lights and powers : but form the point of view of what is above it, it is the line of the souls turning away from the complete and indivisible knowledge and its descent towards the Ignorance.
Of course, in the overmind there is not yet the actual fall into Ignorance, but the first step is taken which will make the fall inevitable.
Overmind is a plane of consciousness beyond even Universal Mind in ignorance; it carries in itself a first,direct, masterful cognition of cosmic truth.