Mortal Shell 2: Hall of Murmurs Walkthrough and Location

The Hall of Murmurs sits under Castigator’s Keep in the Mammon region, and it takes about three minutes to clear. Its name promises something elaborate. It delivers a short canyon, a handful of brigands, a shack with a fireplace, and one enemy that only wakes up when you touch its loot. Players have spent hours hitting walls and testing items in here looking for a deeper mechanic, which is the main reason the place has a reputation at all.

Quick answer: Ride the elevator down, kill the shielded brigands with heavy attacks, break the illusory wall on the right for roughly 700 coins, then enter the shack, take the coin pouches and the Laterite from the fireplace, and kill the Foul Knight that spawns when you grab it. That completes the dungeon.

Hall of Murmurs location in Castigator’s Keep

Getting to Castigator’s Keep requires enough Ova to cleanse the corruption blocking the second jump pad at Marrow Keep. Cleansing beacons or beating bosses in Fainweald will cover that. Once the black gunk is gone, take the jump pad to the Outskirts of Mammon Beacon.

From there it is a straight run south. Head for the blasted gate with the large group of soldiers, follow the bridge to its end, use the bone gate to jump the gap, then stay on the main road until Castigator’s Keep appears.

The Harbinger leaping across a flooded courtyard on the road toward Castigator's Keep — The bone gate jump on the Road to Absolution, between the Outskirts of Mammon and Castigator’s Keep. Image: Cold Symmetry

The keep’s beacon sits on the gate battlement, reached by climbing the wooden scaffolding. Activate it before you go any further, because it is the closest respawn point to the dungeon and the only checkpoint you will get down there.

From the beacon, enter the inner gate (or take the cliffside path if this is your first visit), then take the stairs on the far right. Follow that path until you reach the Grisha Hunter camp and turn left. The entrance is set into the ground, a set of stairs descending underground rather than a doorway, which is why people run past it.

The Harbinger moving through the ruined battleground of Castigator's Keep with the full HUD visible — The ruined ground of Castigator’s Keep, where the dungeon entrance is set into the floor near the Grisha Hunter camp. Image: Cold Symmetry

Hall of Murmurs walkthrough

Go down the stairs and follow the passage. It is linear, so there is nothing to miss on the way in. If you hit what looks like a dead end, check the right side for a lever that raises the elevator.

Ride the elevator down. You land in a narrow canyon with a group of brigands stationed in front of a wooden shack wedged between the rock faces. Two of them carry shields.

Break the shields with heavy attacks. Light attacks bounce off them, and at this point in the game one or two heavy swings is usually enough per enemy. The dungeon holds five enemies in total, so this fight is most of them.

The Harbinger swinging at a brigand in the rocky canyon below the Hall of Murmurs elevator — Clearing the shielded brigands in the canyon outside the shack. Heavy attacks break their guard. Image: Cold Symmetry

Before entering the shack, turn to the illusory wall on the right side of the canyon. It carries the usual white mark that flags false walls in Mortal Shell 2, and it sits opposite the blocked door of the fireplace room. Hit it to open it.

Deal with the Pale Leech inside. The hidden pocket holds around seven pouches of gold, roughly 700 coins, and nothing else. It works in both day and Night Mode.

Gloom and coin reward notifications appearing after killing the enemy hidden behind the false wall — Gloom and coin pickups register on the right of the screen after clearing the stash behind the illusory wall. Image: Cold Symmetry

Break down the wooden door under the archway and step into the fireplace room. A pouch of 500 coins sits on a caged box to the left of the doorway, with another 250 behind it.

Walk up to the fireplace. A husk of a person kneels in front of it, praying, and it will not react to you. The shiny pickup in front of it is a Laterite.

Take the Laterite. Dark smoke wraps the kneeling figure and it stands up as a Foul Knight, the long-necked enemy with tentacle arms. It hits considerably harder than the brigands, so do not treat it as another trash mob.

Kill the Foul Knight. It drops a large amount of Gloom plus some gold, and its death is what registers the dungeon as cleared. Sweep the shack, then ride the elevator back up to the Castigator’s Keep beacon.

The Harbinger walking out through a stone doorway on the way back to the elevator — Heading back out. There is nothing left behind you once the Foul Knight is down. Image: Cold Symmetry

Full Hall of Murmurs reward list

Reward	Where it is
500 Coins	Caged box, left of the shack doorway
250 Coins	Behind the first coin pouch
~700 Coins	Behind the illusory wall in the canyon
Laterite	In front of the fireplace, by the praying husk
Gloom and gold	Dropped by the Foul Knight

The Laterite is a forge material, so triggering the Foul Knight is worth doing rather than leaving the pickup alone. There are no chests and no traps in here, and no named boss, so you do not need to prepare for a set-piece fight before dropping in.

Why players think the Hall of Murmurs has a hidden puzzle

The layout invites suspicion. A passive NPC kneeling in prayer, a blood trail, a name built around sound, and an elevator with no visible floor beneath it all read like setup for a mechanic. Mortal Shell 2 rewards that instinct elsewhere, which is exactly why so many people have refused to accept that this room is just a room.

Comment
byu/GraesynFaust from discussion
inMortalShell

None of the obvious experiments produce a result. Playing the Troubadour’s Lute for the praying figure does nothing, and neither does switching songs. Night Mode changes nothing about the layout. Summoning with the Grisha Remnant, using the Sheephead Totem, and shouting with the Cursed Child all fall flat. Following the blood trail leads nowhere, and luring the brigands into the shack has no effect.

Two oddities keep the theory alive. Gloom dropped on death has been seen spawning behind a wall in the next room over, and a lightning attack has been reported damaging an enemy through a wall. Both are more consistent with loose collision than with a designed secret. The illusory wall in the canyon is the only genuine hidden area anyone has confirmed, and it holds coins.

Note: If you have swung at every surface and nothing opened, look specifically at the wall right of where you first meet the shielded brigands, directly across from the blocked door. It is easy to miss because the mark blends into the rock.

How to confirm the dungeon is complete

Killing the Foul Knight is the completion trigger. Once it dies, the dungeon has no remaining objective, and you can use the Mark Complete option on the map entry to keep your own tracking tidy. The area itself has no map, so the entry is the only record you get.

The praying figure respawns if you leave and come back in, which has fed a fair bit of the puzzle speculation. That respawn is not a reset condition for a hidden state, and the Laterite does not come back with it.

Nothing here gates story progress. If you stumble into the entrance early, you can walk away and return whenever without losing access to anything, and clearing it only matters for regional completion and the coins.