Hollow Knight: Silksong – Putrified Ducts Route, L
Reach Hollow Knight: Silksong’s elusive Putrified Ducts via Memorium with this route guide, covering the hidden entrance and key obstacles.
In 2026, Hollow Knight: Silksong players are still mapping every corner of Pharloom, and the Putrified Ducts remains one of the most elusive optional regions. It is among the couple of tricky areas that are only accessed through a specific route, and the path is not in plain sight. Hornet must destroy an obstacle to reveal the entrance, which makes the journey feel like a secret within a secret. Although reaching the Putrified Ducts can be time-consuming, the area contains many points of interest that make the trip worthwhile.
The Main Route Begins in Memorium
The Putrified Ducts is mainly available from the Memorium area in Hollow Knight: Silksong. A lower part can be accessed from Bilewater, but that small section does not connect to the rest of the region. What players will find there is the Broodfeast quest and the Key of Apostate. For the full experience, the Memorium approach is required.
To start, players should enter Memorium by heading north from the Grand Bellway, all the way to the top. Next, they must use the double jump, which is a necessity, to climb the platform and access the area. In Memorium, Hornet should jump to the platform containing the lore board, then hop to the one above it. Hornet will arrive at the second level of the area, and the path will split.
Through the Enemy Corridor
Proceeding right leads to an area infested with enemies in all shapes and forms. Players must fight the small and big spiders, then keep running to stumble upon a mini-boss near the end of the path. The mini-boss can be fought or ignored completely to quickly go through the door. After that, players should look down and carefully descend the platforms to reach the bottom while avoiding the enemies that roll around. This section rewards patience more than aggression.
Go through the door to the right with the hanging sign to enter a seemingly empty room. Walk inside further and look up to find a narrow tunnel. Double jump and Clawline upward, then proceed forward to land on a bridge. At the end of the bridge is a tall climbable wall. Using a combination of skills like cling grip and double jump is essential. Between the two walls is an obstacle that can be destroyed. Carefully stick Hornet to the wall and try to destroy the rocks to reveal a path.
Head right and enter the dimly lit tunnel. Proceed further without touching the spikes, and players will eventually reach the Putrified Ducts area. It is very similar to Bilewater, especially the maggot-filled swamp that decreases Hornet’s silk. Luckily, there is an item in this area that can protect Hornet from this water for a short period of time. Additionally, there is an NPC that will help reveal the locations of the fleas that were missed while exploring Pharloom.
Route Summary Table
Step
Location
Required Ability or Item
Notes
1
Grand Bellway
Double jump
Head north to the top and climb into Memorium
2
Memorium
Double jump
Jump to the lore board platform, then to the one above
3
Split path
Combat or evasion
Proceed right into the enemy-infested corridor
4
Mini-boss room
Optional fight
The mini-boss can be skipped to reach the door faster
5
Descending platforms
Careful movement
Avoid the rolling enemies below
6
Empty room
Clawline and double jump
Look up for the narrow tunnel
7
Bridge and wall
Cling grip and double jump
Destroy the obstacle between the walls
8
Dim tunnel
Spike avoidance
Reach the Putrified Ducts
9
Putrified Ducts
Silk protection item
The swamp drains silk; the item grants temporary safety
10
Lower Bilewater section
Broodfeast quest and Key of Apostate
This part is accessible separately from Bilewater
Survival and Exploration Tips
The Putrified Ducts is not a place for careless exploration. The maggot-filled swamp is one of the most punishing environmental hazards in the region because it steadily decreases Hornet’s silk. Players should locate the protective item early, then use its short window to cross dangerous stretches and reach safer ground. Silk management becomes a priority, since Hornet may need healing or offensive tools while navigating enemies and spikes.
The NPC in the area is another major reason to visit. This character helps reveal the locations of missed fleas across P