The Khala Collapse

In StarCraft II: Legacy of the Void, Amon takes control of most of the Protoss through the Khala, the telepathic bond that unites the Khalai and Templar. Zeratul and the Nerazim (Dark Templar) are unaffected because their nerve cords are cut; the Aiur Protoss later sever theirs as well, cutting themselves off from the Khala and denying Amon an anchor in real space.