The old sci-fi movie "Forbidden Planet" gave me an idea of how the Khala leads to applied psi-powers in Protoss. The movie is about a scientist who creates a machine which makes a working projection of his subconscious, whether he wills it to or not. He can't control it but it carries out his will, even if he doesn't know what his will is, or even would want it done long-term if he did, for instance he doesn't approve of his daughter's love interest, so the "Monster from the id" as it's called (id being the psychological term for subconscious) starts trying to kill his daughter's love interest.
The Protoss certainly have better control, but the idea remains the same, the Khala is something like a giant collective-unconscious, the nerve cords of the Khalai allow them to tap into it and apply the power from the id. The more effectively a Khalai can tap into the collective id the more powerful they can be. The ease with which they interface with it may be determined by how high their PI is. Meaning that A Dark Templar with the same PI as a High Templar counterpart would be just as dangerous in combat, as he would be able to tap into the Void in the same way the High Templar can tap into the Khala, relative to their raw psychic potential.
I think Terran could theoretically tap in to the Void as it doesn't seem to require anything beyond knowledge of how to do so, however, as of yet, they don't have that knowledge. I think it's worth noting that in every culture but the Zerg, psychic power source seems to be based on the culture of the race/faction using it. The Dark Templar use Void, which epitomizes isolation, and their culture is largely based on independence, The High Templar use a collective unconscious, and there's is based on unity. The Terran's defining characteristic is adaptability, and they're psychics don't seems to need a distinct power-source.




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