This guide will tell you the solution to the Hell is Us The Watcher's Nest Pentos Puzzle and explain the rewards you'll get for completing it.

Hell is Us The Watcher's Nest Pentos Puzzle Solution
Let's get moving with the Hell is Us The Watcher's Nest Pentos Puzzle Solution! First, you'll need to travel to Vyssa Hills on the map. Next, you'll need to get the Emblem - Book and Emblem - Candle off of Agatha Maren's body and from Tania Alver, respectively.
With those two items in hand, you can head to the door up in the cliffs a short distance away from Tania Alver. Head inside, save your game, and you'll be confronted with a very large room with a lot of circles in the walls. You have to slot items into these circles, but we'll need to get the proverbial keys first.
Go into the breach in the wall and you'll find a tomb underneath the Watcher's Nest. Collect the four Ceramic Flowers sitting on the stone coffin underneath the Watcher's Nest. Head back up the ladder.
Use your drone to scan the tablet located under the painting of Pentos Algea in the center of his tomb, situated underneath the Watcher's Nest. This tells you he was the Warden of Grief.
Find the wooden symbol for the Warden of Grief on the wall immediately to the left by reading the tablet, then put one of the Ceramic Flowers in the matching socket in the round room upstairs. Scan the round tablet in the room and it will tell you that the Vigil was founded in 1513.
Next, scan the Helm and Coif (the cloak and mask) in the hall near the tomb; this tells you that Pentos's last name is Algea and that he belonged to the Vigil. Put a Ceramic Flower in the socket marked "Algea" behind the whiteboard in the room with all of the computers.

Then, head down to the metal shields near the save point and place a Ceramic Flower in the socket underneath the rightmost metal shield, which is the symbol of the Vigil.
Finally, head to the long, blue hanging banner to the right of the whiteboard. As the whiteboard explains, the socket on the left is for 1512 and the socket on the right is for 1513. Place the final Ceramic Flower in the slot for 1513 and you'll hear a rumbling, indicating that you correctly solved this part of the puzzle."
Ultimately, you must place them in the slots for the Warden of Grief (Pentos' position), the slot for the Vigil (Pentos' organization), the slot for Algea (Pentos' last name), and the slot to the right of the blue banner (which represents 1513, the year the Vigil or the Watcher's Nest was founded).
Completing this puzzle will allow you to go back underground and open up the tomb. Inside, you'll find the Passive Relic "Mark of the Betrayed" and the Investigation Item "Blue Flower Scroll," the latter of which has clues on how to solve the Lake Cynon Reservoir puzzle.
Climb back up the ladder and you'll see a man sitting there in a wheelchair. This is Gildas Brom, a member of the Vigil — the same organization your father belonged to. He has a lot to tell you about the world, so make sure to take time to talk to him.
Knowledge aside, Gildas Brom will also give you the Guardian Detector, an Investigation Item that can be used to detect Timeloop Guardians. You can also visit Gildas Brom after completing Good Deeds and Timeloops to collect rewards such as Glyphs and other useful items.
Gildas Brom will also open up access to Lake Cynon on the map. This next location has an equally challenging Reservoir puzzle to uncover — and a rather large dungeon underneath it.
We're at the end of our Hell is Us The Watcher's Nest Pentos Puzzle Guide. You can read our other guides for this game below!