This is the first of several quests involved in the upgrade of Mythic Weapons.
After receiving Captain Wildcat Badge and waiting until Japanese_Midnight, walk into Salaheem's Sentinels. The quest cutscene will begin when you reach the ramp.
You must obtain a Runic Key and a Nyzul Weapon dropped from any of the NMs of Nyzul Isle Investigation, and then trade the Nyzul Weapon (of your choice) to Abquhbah. Trading a weapon without having a Runic Key in possession will result in Abquhbah informing you that you must first obtain a Runic Key.
You must now defeat or have defeated all of the following mobs:
To qualify as having beaten these mobs, you need to acquire the title.
Speaking to Naja after starting the quest will give you the option to have Naja review each of the three objectives (Chariots/Kings/Odin) with you. After completing one of the three objectives, she will no longer offer this as an option for review. Until one category is complete, however, she will not acknowledge any sort of progress. You do not need to currently have the title (or titles) in order for Naja to be aware that you have defeated an NM.
Once you have defeated all eight NM's, return to and speak with Naja Salaheem.
Locate and retrieve the ancient weapons stolen from the Imperial Treasury. Quartz transmitters planted on the weapons indicate that they lay somewhere in the deepest ruins of Nyzul Isle...