Online:The Venom of Ahknara

Quick Walkthrough
#Get the Blinding Light Flasks upstairs in the Fort Arand Headquarters.
#Kill Althineh, Narzdush, and Vhos al-Kozanset.
#Investigate the eastern tower and enter the Fort Arand Dungeons to speak to Strikes-from-Shadows.
#Activate the Second, Third, and Fourth Plates, meeting Strikes-from-Shadows at the Fifth.
#Defeat Ahknara.
#Return to Captain Llaari through the trapdoor to the Headquarters.

Detailed Walkthrough
As soon as the quest begins, you can start collecting information about Fort Arand and the dungeons below it. Ask Captain Llaari about the fort and she'll reply colorfully. She can tell you about Ahknara, but not much about the fort. The day's lessons are over, so be sure to grab the Blinding Light Flasks before leaving the Fort Arand Headquarters; they're just upstairs from Captain Llaari.

Once outside, search along the inside walls of Fort Arand. The three Covenant infiltrators are completely hidden; the only way to find them is to first find the small piles of slaughtered guards they've left behind, then use the Blinding Light Flasks while standing over these piles. Althineh, Narzdush, and Vhos al-Kozanset will each appear, one for each time you use a flask at a new pile. You will have to defeat each one, and don't expect much help from the oblivious guards around you. Be prepared for Narzdush's bow, and duel-wielded swords from the other two.

Once you are victorious, head to the eastern tower. In the doorway is an Argonian Pact Soldier, dead. Examine the body.
:    

Your obvious next course of action is to cross the small room and enter the trapdoor. Strikes-from-Shadows is indeed down there, crouched stealthily with Baem Farelas at his side. He'll ask you if the assassins you were sent to kill are dead, and is pleased to hear that they are. He explains that he was ambushed. Obviously, the assassins that were after him failed in their mission. As for your next objective, Strikes explains that there are several pressure plates throughout the dungeons that when pressed, activate defenses that will imprison anyone still inside when they're activated. There's an exit to the surface behind the final plate, so don't worry about your escape. There are five plates, and Strikes-from-Shadows has already pressed one. You need to activate three more of those plates and meet him by the last chamber.

200px|thumb|left|An activated plateThere's no more questions to ask, and it is now time to make your way through the Covenant-filled tunnels. Some are sweeping the old floors clean, others shoveling debris out of the way, and the rest standing guard--but all are hostile on sight. They can typically be taken on in ones or twos however. Be sure to activate each of the three plates as you pass over them into new rooms. In the final room with the stairs leading up to the fifth plate that Strikes-from-Shadows pointed out, note that one follower of Ahknara is inconspicuously and inconveniently standing behind the staircase. Attempting to sneak through that way will likely end in you fighting the entire roomful, with at least six Covenant pyromancers and guardians.

When you meet Strikes-from-Shadows at the final plate, Baem Farelas is no longer with him. He explains, that Ahknara ambushed his group and ran through the door behind him. Baem chased after her. When inform him that you activated the plates, he will tell you that he'll activate the last one. Don't worry about him, just go kill Ahknara. You will not be able to use the trapdoor until Ahknara has been taken care of. 

When you leave the dungeon you will almost immediately stumble across Baem Farelas' dead body. Just past him is Ahknara, crouched on the bluff and looking over Fort Arand below. She is very slippery and can turn invisible, but gives you plenty of time to block her attacks. 

Once she is dead and Baem avenged, return to the Fort Arand Headquarters and speak to Captain Llaari. You'll find Strikes-from-Shadows back safely as well. Strikes-from-Shadows will congratulate you on your immense victory, and telling Captain Llaari about your deeds will complete the quest and net you your reward, as well as Llaari's satisfaction.
:''"Ha! My fine f'lah! I'll see your name is not forgotten. Ahknara, however, will be forgotten. The Dunmer reshape history to serve their needs. I'll remove any mention of her actions here, and I'll purge all records of that vile assassin."'' 

She'll also comment a brief tribute to Captain Hjolm.
:"Captain Hjolm lost his life bravely defending the fort from that Covenant scum. He cut down a score of them, but eventually succumbed to his wounds. That magnificent fetcher will be missed."
Sergeant Eila will say much the same if you meet her outside, fist over her heart and head bowed:
:"Captain Hjolm will be forever honored, along with the others slain here. Their deaths will fuel our conviction to slaughter the Covenant."
  

Bugs
 
ZOS reports that this is working as intended as it cannot easily be fixed due to certain system limitations.

Quest Stages