Keystone Citadel

Flooded Halls: Upon entering the Citadel, use the nearby Checkpoint Crystal. In the large flooded room, defeat the Warden using your gauntlet from a distance before finishing him off. Loot the area for an Audio Note (After the War: New Disciple) near the stairs, a Human Skull on the floor, and an Anvil by the door to the next area.

Main Hall: After climbing the stairs, kill the Rogue on the right and find an Audio Note (After the War: Judge Disciple) in the opposite corner. Use cover to defeat the Crossbowman on the next set of stairs with your gauntlet. At the top, deal with the Crossbowman first, then the Marauder. Fight the Spellcaster at the end of the hallway, avoiding its attacks and death explosion. After defeating the Spellcaster, be prepared for two Rogues to spawn behind you; kite them downstairs if needed. Return to the room on the left before the Spellcaster's hallway to find two Audio Notes (The Plot: Join Me and After the War: Old Priest). Note the rune-locked door in the Spellcaster's hallway for later. Peek into the next room to spot a Warden and an Infected playing dead. Engage the Warden by luring it back to the previous area for more space, then defeat the Infected.

Inner Chambers: At the top of the stairs is a locked door (shortcut). In a short dead end to the left, defeat a Rhogar Knight and find a new Weapon (Axe - Gargoyle and Hawk). Continue up the stairs and assist the Citadel guards in defeating a Shieldman and a Crossbowman. After a cut-scene, loot the Audio Note (After the War: Angry Priest) near the fire. In the next room, the right-hand room contains a breakable wall leading to a chest with an Armour Set (Will). The left-hand room contains an Audio Note (After the War: The Rebel). If you previously cut off the Injured Monk's hand and gave him a potion, you can speak with him here to advance his side-quest if you have already cleared the spider in the southern watchtower. Return to the central room and take the remaining exit. Grab the Audio Note (The Research: Books) below the stairs and ascend the spiral staircase. At the top, a Checkpoint Crystal and an Anvil are in the room to the right. Use the lift to reach the top of the Citadel. Exit the lift and turn around to find an Audio Note (My Vow: I Swear To Her) on the balcony. Return to the soldiers for a cut-scene. After the cut-scene, return down the lift and stairs to the doorway on the left to enter the Planetarium.

The Planetarium: Inside, you'll find two locked chests that cannot be opened yet. Proceed to the stairs. Use your gauntlet to eliminate the Crossbowman below before engaging the Knight between the stairs. Loot the chest near the Knight's initial position for a Shield (Buckler - Harmony).