Oong was a protoss high templar who witnessed the zerg attacks on the Koprulu Sector. He reported to the Elders or Wise Ones (presumably the Conclave) these creatures, resembling those found in ancient histories recounting the last days of the xel'naga, sought to destroy the protoss. He requested 5000 Templars to assist his investigation and fend off uncooperative terrans. He was sent on the expedition.