Once there, speak with Zha Gu'Lau at Murdunk Falls ( -320, 3, 105 ).
He informs you of Danarin Theerego's plan and has one of his own. The first step, is to retrieve some skulls:
Dar'Lek'ss skull can be found at -1025, 6, 710 (Fear Camp) in chest inside tent.
Vul'Thos' skull can be found at -1260, 4, 685 (Alliz Tae Outpost) in chest inside tent.
Now you have those, summon the owners of the skulls (Level 74) and kill them atop the Eye of Thule ( -323, 9, 853 ). This is done by using the item in your inventory and must be done once per person in the group.
Place the shards in the statues at the entrance (Big squid heads immediately to the left and right as soon as you zone in. If you -really- need loc's to find them, then they're at 7, 7, 145 , and -7, 7, 145 }. This will summon the Thulian Arch-Guardian (spawns at 1, 25, 61 , and runs to the zone in.) Note: If you fail to kill him you must wait approx. 10 minutes before you can start the event again. He is Level 70, ^^^