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Cogwork Heart: All Cogheart Piece Locations and How to Use It

Collect the three Cogheart Pieces from Choral Chambers, Whispering Vaults, and Memorium, then use the assembled heart to reactivate the Second Sentinel in Cogwork Core.
Length2 min Posted Quest giverVGSources Team
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To get the Cogwork Heart in Hollow Knight: Silksong, collect the three Cogheart Pieces in Choral Chambers, Whispering Vaults, and Memorium, then take the assembled heart to the dormant Second Sentinel in Cogwork Core. Each piece is earned by solving a bell-memory puzzle: listen to the sequence and strike the bells in the same order.

Where to find all three Cogheart Pieces

The Cogheart is assembled from three pieces, one in each of these areas. The item entry and walkthroughs agree on the locations and the bell-memory puzzle mechanic. See the Hollow Knight Wiki’s Cogheart entry and the Silksong Wiki’s Final Audience walkthrough.

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  • Choral Chambers: Find and solve the area’s bell-memory puzzle to earn a Cogheart Piece.
  • Whispering Vaults: Solve the bell-memory puzzle here for another piece.
  • Memorium: Solve its bell-memory puzzle for the third piece.

In each puzzle, bells play a sequence that you must repeat by striking them in that order. Listen carefully before entering the sequence; the retrieved guides do not establish one dependable set of bell notes or positions that applies across all three rooms.

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Memorium bell sequence: verify it in your game

Published walkthroughs disagree about the Memorium sequence, so an online sequence may not match your game. The available guides do not establish which version is correct. Use the sequence played by the bells in your room rather than relying on a fixed order copied from a guide. The Silksong Wiki walkthrough and PlayerAuctions guide publish conflicting details.

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How to use the Cogwork Heart

  1. Collect all three Cogheart Pieces from Choral Chambers, Whispering Vaults, and Memorium.
  2. Go to Cogwork Core and find the dormant Second Sentinel.
  3. Use the completed Cogwork Heart on the Sentinel to reactivate it.

The item is described as a deliverable that reactivates the Second Sentinel. The item entry attributes this line to the Sentinel: “Woken, is this sentinel. F-f-f-functional, is its shell.” The item’s use is also tied to the Final Audience Wish. The Game8 Final Audience walkthrough likewise describes combining the three pieces and using the completed heart on the Sentinel.

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What the Final Audience Wish leads to

Guide accounts connect reactivating the Second Sentinel with the Final Audience Wish. The Silksong Wiki walkthrough says the wish culminates in a duel in High Halls and lists Reserve Bind as its reward. These quest details come from published guides; no official Team Cherry source was identified for them.

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