How to Find the Putrified Ducts Map in Hollow Knight Silksong

The Putrified Ducts Map in Hollow Knight Silksong is one of the trickier area maps to acquire, largely because it is tucked away behind hidden passages and vine-like bugs that can ensnare Hornet. Unlike more straightforward regions, the Ducts require both preparation and clever use of environmental hazards.

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In this guide, we’ll cover the location of the Putrified Ducts Map, what you need before heading there, and the exact path to take so you don’t miss it.

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Prerequisites for Entering the Putrified Ducts

Before you attempt to reach the Putrified Ducts in Hollow Knight Silksong, you’ll need:

• Access through Memorium or Bilewater – Both regions contain hidden entryways that lead into the Ducts.
• The Faydown Cloak – Obtained at the peak of Mount Fay, this ability is essential for navigating the tricky platforming sections inside the Ducts. Without it, you won’t be able to progress.

Entering the Putrified Ducts from Memorium

While the Ducts can also be reached from Bilewater, here’s a detailed breakdown of how to get there via Memorium:

1. Start from Memorium – Move all the way to the right until you reach a room that looks like a dead end.

2. Find the secret passage – Double jump toward the top-right corner to reveal a narrow path. Follow it until you emerge on a balcony.

3. Descend and push left – From here, head down and move left until you encounter a wall. Use a double jump to scale it and break through rocks blocking your way.

4. Head deeper inside – Continue rightward, using double jumps where needed, until you finally enter the Putrified Ducts.

Navigating to the Map Room

Once inside the Ducts, here’s how to reach the map:

• Proceed right from the entry room – Watch out for the ceiling tentacles. Strike them to safely trigger their traps before crossing.
• Drop carefully in the vertical chamber – In the next room, move down slowly along the vertical drop. Midway, you’ll spot a vine hanging above a left-side doorway. Strike the vine to disable the trap and enter.
• Cross the vine-trapped room – Inside, another vine trap awaits. Trigger it safely, then continue left.
• Use the vines to your advantage – At the far-left section, double jump into the vines so they latch onto Hornet. Let them pull you up and then drop down into the hidden section.

Here, you’ll finally find the Putrified Ducts Map in Hollow Knight Silksong, completing your journey.

Why the Putrified Ducts Map is Important

This map is especially useful because:

• The Ducts are full of hidden traps and ambush bugs. Having the map helps with navigation.
• Knowing both entry routes (from Memorium and Bilewater) allows for easier exploration and farming.
• It ties into progression, as mastering its hidden mechanics is essential for exploring late-game areas.