I’m not 100% sure which of all the ongoing events that are needed for Arah to open but I’ve noticed that:
1. Magister Izzmek stucks about 60 meters away from his final destination for lightning some signal beacon. (Quest named: Escort Magister Izzmek to the site of the first signal beacon)
Pic: http://i45.tinypic.com/156sm5w.jpg
2. Warmaster Jofast seems to be chilling under a bridge instead of completing his objective south of Noose Road. (Questname: Pact Operation Southern Advancement) If you ressurect Jofast you trigger the event to defend the camp once you “succeed” with the event. Nothing changes… Jofast continues to chill under the bridge and dies eventually → rinse and repeat … nothing proceeds / changes.
Pic: http://i46.tinypic.com/97r71w.jpg