☆ Walkthrough in Progress: Bookmark for Updates!
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☆ Full Interactive Map of Pharloom!
★ Mask Shards | Spool Fragments | Abilities
☆ Boss Guides: The Unravelled | First Sinner
★ Wishes: Broodfeast | The Lost Fleas

Unlocking Act 3 of Hollow Knight: Silksong requires you to complete the Silk and Soul Wish, defeat Grand Mother Silk, and use the Needolin. See all the unlock requirements to reach Act 3 after the credits roll in Act 2.
List of Contents
Act 3 is unlocked when the wish called Silk and Soul can be accepted from the Caretaker of Songclave.
You need to do the following to unlock this wish:

Hornet's pin is Lace's Location in Act 2!
One of Act 3's requirements is to beat Lace in Act 2 when you confront them in The Cradle. Do note that you do not need to beat Act 2's Final Boss to unlock Act 3!

Other than beating the Act 2 main story bosses, you also need to finish all wishes, even the ones outside of the wish boards!
All Wishes and Side Quest Locations

The last requirement to unlock Act 3 is to move the caravan to Fleatopia by locating a certain number of Fleas. While we currently don't know the exact number of fleas needed to be located, the caravan will likely move to Fleatopia after locating 23 to 25 fleas!
All Flea Locations

Defeat Grand Mother Silk and instead of binding her, use the Needolin to trap her in the Abyss and unlock the Snarled Silk Ending.
Grand Mother Silk: Final Boss Guide
After the credits roll, load your save file to begin Act 3. Clear the abyss the unlock it.

Walkthrough and Progression Guide
| List of Walkthrough Guides | |
|---|---|
| How to Unlock Act 3 | Heart of the Wild |
| Heart of the Woods | Heart of Might |
| Conjoined Heart | - |
I think you need 50% - 70% of all wishes to trigger this
How to Unlock Act 3 and Requirements



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According to BlueSR a speed runner you need 23 fleas and 17 wishes in Hollow Knight: Silksong True Ending Speedrun in 3:56:12! (WORLD RECORD). A video on youtube