☆ Walkthrough in Progress: Bookmark for Updates!
★ Best Crest Builds | Best Tools
☆ Full Interactive Map of Pharloom!
★ Mask Shards | Spool Fragments | Abilities
☆ Boss Guides: The Unravelled | First Sinner
★ Wishes: Broodfeast | The Lost Fleas
Infestation Operation is a Wayfarer Wish in Hollow Knight: Silksong. Read on to see a full walkthrough to completing the side quest, rewards, how to start, and its objectives.
List of Contents

The Infestation Operation is a quest that can only be started after completing the Rite of Rebirth quest. You'll first need to obtain the Twisted Bud in Bilewater then talk to Greyroot while carrying the bud to get cursed and start the said quest.
| Benjin and Crull | Map Location |
|---|---|
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To complete Infestation Operation, head to Crull and Benjin's location on Sinner's Road. Their room can only be accessed from the jail area by completing a short platforming section leading to the upper corner of the map. Once you find Benjin and Crull, purchase the Steel Spines from them for 160 Rosaries to complete the wish.
| Yarnaby | Map Location |
|---|---|
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Once you have obtained the Steel Spines, make your way back to Yarnaby's home and give her the Steel Spines to complete the Infestation Operation Wish.
Upon completing Infestation operation, players will be rewarded with the Witch Crest. This allows Hornet to deal damage while binding.
Witch Crest Location and Best Build
| Yarnaby | Map Location |
|---|---|
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The quest's starting location is at the Northwest corner of Greymoor's map. This zone can easily be accessed by using the lift to the left of Halfway Home. If the lift isn't activated, you'll need to climb the tower to the left of Halfway Home and trigger it from there.
| Quest Giver | Yarnaby |
|---|---|
| Quest Location | Greymoor |
| Objective(s) | Purchase Steel Spines from Crull and Benjin in Sinner's Road |
| How to Unlock | After accepting Rite of Rebirth, call out Yarnaby outside her home |

All Wish Locations and Rewards
I can't get the steel spikes in Act 3. What should I do?
Infestation Operation Walkthrough



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