Note: You cannot save progress on this mission. If you wipe without a way to reraise or otherwise have to quit, you have to start from the beginning. So make sure everyone has a few hours available before you start. (At 99/ilevel the escort takes 30-40 minutes solo). You do not personally have to utilize each Quasilumin escort NPC, you merely have to reach the Ix'ghrah spawn point. You can pass through doors opened by strangers and progress through the mission.