In Hollow Knight Silksong, there is a NPC called the second sentinel that you can unlock. To Get the NPC first you will find the inert automation with empty chest. You will place three Coghearts pieces in that empty chest to get the NPC. To get these Coghearts, you will solve three bell puzzles, each for every Cogheart.
To have a complete Cogheart you need all its three pieces scattered on the map. Once you have the trick to complete all the bell puzzle you will get the NPC second Sentinel in Hollow Knight Silk Song.
How To Solve All Bell Puzzles To get Coghearts Pieces
To get all three pieces you will be going to different Coghearts locations and solve the three bell puzzles. At each location there is a platform where you can stand on. Each time you stand on it the bells go off in a specific pattern, just remember the pattern and strike the bells in exactly the same order. In some cases there are more than one round of puzzle pattern that you need to solve.
Choral Chambers Bell Puzzle Solution
The first bell puzzle is in Choral Chamber where there are three rounds of bell pattern, try to be quick don’t just wait around or delay hitting the bells in a specific pattern
Memorium Bell Puzzle Solution
The second bell puzzle is at Memorium and the solution to that bell puzzle in a given sequence is as follows.
Whispers Vaults Bell Puzzle Solution
The last bell puzzle is in Whispering Vaults solving it will give you the last piece of Cogheart to complete the heart and place it in the empty chest of NPC.
With all three Cogheatrs in your procession, head to the location of the second sentinel and bring it to life using the Coghearts.
