The Venom of Ahknara
Covenant troops have killed Captain Hjolm of Fort Arand, and they're threatening the safety of the recruits within the fort. Captain Llaari hatched a plan to respond the threat.
Get Blinding Light Flasks:
Captain Llaari's plan revolves around some alchemical weapons. I should get some flasks of blinding light from the second floor of the command post.
Find an Kill Assassins:
Captain Llaari thinks the Covenant assassins will be lurking near the walls of the fort. I should use the flasks of blinding light until I uncover the infiltrators. Then I must kill them.
HINT: I should look for the assassins near slain Pact soldiers.
Investigate the Eastern Tower:
I've slain a number of assassins within the walls of Fort Arand. Llaari asked me to speak with Strikes-from-Shadows about the next step for repelling the Covenant. Strikes-from-Shadows should be waiting at the tower on the eastern side of the fort.
Use the Trap Door:
I've found some dead troops inside the tower on the fort's eastern side. There was a fight between Pact and Covenant forces. Strikes-from-Shadows might have used the trapdoor in the room to escape. I should climb down and look for him.
Talk to Strikes-from-Shadows:
I found Strikes-from-Shadows. I need to speak with him.
Activate the floor plates:
Covenant soldiers plan to attack the fort from below. I must seal them down here by activating several floor plates. That will create a magical barrier. Strikes-from-Shadows asked me to activate three plates befroe meeting him in the last chamber.
I have one last plate to activate. Strikes-from-Shadows asked me to slay Ahknara. He'll activate the last plate as he exits behind me. Ahknara is waiting outside the door behind Strikes-from-Shadows.
Use the Trap Door:
I've killed Ahknara. I should enter the trapdoor and return to Fort Arand.
Talk to Captain Llaari:
I must tell Captain Llaari of Ahknara's demise.
— game journal
This quest is part of the Fort Arand Objective.