Find Kaslo | Keystone Citadel Lords of the Fallen Guide

At the foot of the stairs, you run into a Marauder. Behind the door, there are two Infested, a note, a weapons chest and a hidden passage.

After the battle you can replenish your potions, by activating the checkpoint, and also buy several attribute points, for the experience that you got, which you distribute. Also, remember to return to the teleporter [M1.#1], to claim your reward. Then, go to the Initiation Chamber and walk through the door (the one on the right). After you defeat the two Infested, climb downstairs (before that, you will find a note), and open the first door (watch out for the Marauder on the stairs), behind which there are two more Infested, a weapons chest (Monk's Staff) [M1.12] and a note.

The wall that you can smash by charging (opposite the chest).

Note: while facing the wall, opposite the chest, you can use the shield charge (sprinting towards the wall, while holding the shield up (block)) thanks to which you will smash the wall and find a secret chamber [M1.13], with a Small Cellar Key inside. Deeper inside, there also is a Spider that may be somewhat problematic to kill (first of all, watch out for its jumps and poison attack). Then: in the path to the right, at the end of the corridor, there also is a door, where there is a Key to the chest in the main hall and a checkpoint. And more Spiders - if they are too strong for you, sprint ahead for the items and escape from here. In the left corner of the secret chamber, there also is a Human Skull.

After you exit, hop over the barrier and, in the area in the screenshot, find the Key to the door in the Northern Monastery Wing [M1.7]. Go downstairs and you will find one more note and the Citadel exit [M1.6], and an armor set in the chest (Priest/Rogue/Fighter; depending on the class that you have initially picked).

To find the hidden passage, climb to the balcony.

Return to the starting point. On one side of the stairs (the other one from where you found the note) jump onto the railing and jump over onto the balcony [M1.8]. At the end of the path, there is a hidden door (watch out, hop over the chasm beforehand), which you can open with the Key to the door in the Northern Monastery Wing. Collect The Shard of Heroes and return to the Citadel Exit [M1.6].