Protoss Strike Force
Ulrezaj had stolen a sacred khaydarin crystal from Shakuras, and while tracking it, the protoss discovered that Ulrezaj had created five twisted khaydarin crystals on Char. He was using them to control zerg minions.
Zeratul needed a dark archon to destroy the warped crystals, as only its psychic fury was capable of it. A Dark Archon Hero was accompanied by a pair of Dragoon Heroes as well as several other heroes.