Might just be some lore i missed, but doesn't the existence of the disciples confirm that the pyramids aren't piloted by any one race? then again, tormentors.
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It seems there is no One Race of Darkness, kinda harmony that there isn't just 1 Pyramid. From the Description of the Tormentors, it appears they Resemble Ruhlk, in a way, could be Clones of him, or that's the Shape they Take after the Transformation. Kinda like Taken. The Tormentors could be Enslaved Beings, Broken and put back together as...well that. Well know more as we get Closer.