How to unlock Act 3 in Hollow Knight Silksong

Hollow Knight Silksong seems to end after two acts, with credits rolling once you complete the same. However, as expected, Team Cherry has added a few secrets, with the Act 3 being one of them. Titled “Abyss,” this particular act isn’t easy to unlock, and there are several prerequisites that you will have to meet.
If you are looking for further details on unlocking the secret Act 3 in Hollow Knight Silksong, you are at the right place. The section below provides a detailed guide on everything that you will have to do.
Unlocking Act 3 in Hollow Knight Silksong
To access Act 3 in Hollow Knight Silksong, you will have to first complete the Wayfarer Wish called Silk and Soul, and the same itself takes a lot of things. Once you are done with the same, there are a few steps that will allow you to access the secret additional content.
Listed below are the steps that will allow you to unlock and complete the Silk and Soul Wish
Complete every list possible
You will have to complete nearly every possible Wish in Hollow Knight Silksong. Here is a list of them:

• Pharloom's Crown - Ascend
• Liquid Lacquer - Delivery
• Queen's Egg - Delivery
• An Icon of Hope - Donate
• A Lifesaving Bridge - Donate
• Bellhart's Glory - Donate
• Bone Bottom Repairs - Donate
• Building Up Songclave - Donate
• Restoration of Bellhart - Donate
• Strengthening Songclave - Donate
• Alchemist's Assistant - Gather
• Berry Picking - Gather
• Great Taste of Pharloom - Gather
• Rite of the Pollip - Gather
• Silver Bells - Gather
• Savage Beastfly - Grand Hunt
• The Terrible Tyrant - Grand Hunt
• The Wailing Mother - Grand Hunt
• Broodfest - Hunt
• Cloaks of the Choir - Hunt
• Crawbug Clearing - Hunt
• Fine Pins - Hunt
• Flexible Spines - Hunt
• Garb of the Pilgrims - Hunt
• Roach Guts - Hunt
• Volatile Flintbeetles - Hunt
• Architect's Melody - Learn
• Bugs of Pharloom - Learn
• Conductor's Melody - Learn
• Vaultkeeper's Melody - Learn
• Grand Gate - Open
• The Threadspun Town - Save
• Silent Halls - Search
• The Great Citadel - Seek
• Fastest in Pharloom - Sprint
• Balm for the Wounded - Wayfarer
• Infestation Operation - Wayfarer
• My Missing Brother - Wayfarer
• My Missing Courier - Wayfarer
• Pinmaster's Oil - Wayfarer
• Rite of Rebirth - Wayfarer
• The Lost Fleas - Wayfarer
• The Lost Merchant - Wayfarer
• The Wandering Merchant - Wayfarer
• Trail's End - Wayfarer

Following the same, you must speak with Pavo in Bellhart to receive the Bellhomme companion. You will then have to collect at least 25 Fleas throughout your journey across different areas and also visit Mooshka three times to move the caravan to the Purified Ducts area. Lastly, you can travel to Songclave and speak with the Caretaker to learn about defeating Grand Mother Silk.
Completing the Silk and Soul Wish
These steps will help you complete the Silk and Soul Wish:
Acquire trap components

• Maiden's Soul: Find Maiden in Bone Bottom and trigger the Skull Tyrant fight after sitting at the bench.
• Snare Setter: Access the Needolin door located underneath the Bone Bottom area. Subsequently, find the bench in Weavenest Atla in this hidden section and collect the Snare Setter from above the bench.
• Hermit's Soul: Go to the Bellway area and look for a destructible wall in the pipe. Break through the wall, find the Bell Hermit, who will give you the Hermit's Soul
• Seeker’s Soul: Navigate to the top of Bilewater and find the abandoned bellhome.

Once you have all these, you can give them to the caretaker in Songclave to create the trap.
Grand Mother Silk encounter

• Proceed toward The Cradle area to trigger the final boss encounter
• Meet the Caretaker, who will confirm that your trap has been properly set
• Begin the fight against Grand Mother Silk using standard combat techniques
• Continue fighting until you successfully defeat the boss
• Instead of binding the boss, play the Needolin after the battle

Unlocking Act 3 in Hollow Knight Silksong
These steps will unlock Act 3 in Hollow Knight Silksong :

After the boss fight, you will be sent back to the main menu of the game.

You will find that your save file has its appearance changed, with black vines showing up.

Press the action button repeatedly to break through the vine barriers

Enter the newly unlocked Act 3 Abyss in the game.

With these steps, you will be able to play the special Act 3 in Hollow Knight Silksong.