Hollow Knight: How to Find the Grub in the Watcher's Spire - Player Assist

Learn how to find the grub in the Watcher’s Spire in Hollow Knight!

Hollow Knight, a Metroidvania action-adventure game developed by Team Cherry, follows the story of a nameless warrior known as the Knight as he journeys across Hallownest, a ruined kingdom due to a strange disease. As the Knight travels around Hallownest, he will meet many creatures that will help him completely understand the game’s story. Some of these characters are adorable little creatures known as Grubs.

Grubs are little green critters locked inside glass jars that the Knight will come across all over Hallownest. These Grubs were captured by The Collector, a Void creature who enjoys collecting dead and alive bugs from all across Hallownest and preserving them in glass jars.

The Knight will be aware of the presence of a Grub because its high-pitched crying can be heard in its approximate vicinity. Once found, the Knight can release them by striking the glass jar with the Nail to break it. When the Knight frees a Grub, it makes a high-pitched joyous cry and burrows into the ground to rejoin its colony with the Grubfather.

There are several rewards for freeing a certain amount of Grubs, and there are 46 in total throughout Hallownest:

The Grubfather, located at the northwesternmost portion of the Forgotten Crossroads, will reward the Knight with Geo for the first four Grubs (10 Geo for the first Grub, 20 Geo for the second, 30 Geo for the third, and 40 Geo for the fourth Grub found).
The Grubfather will reward the Knight with a Mask Shard after rescuing the fifth Grub.
The Grubfather will reward the Knight with Geo after liberating the sixth through ninth Grubs (50 Geo for the sixth, 60 Geo for the seventh, 70 Geo for the eighth, and 80 Geo for the ninth Grub found).
The Grubfather will award the Knight with the Grubsong Charm, which allows the Knight to earn Soul upon taking damage after liberating the tenth Grub.
The Grubfather will reward the Knight with Geo after liberating the 11th to 15th Grubs (90 Geo for the 11th, 100 Geo for the 12th, 110 Geo for the 13th, 120 Geo for the 14th, and 130 Geo for the 15th Grub found).
The Grubfather will reward the Knight with a Rancid Egg after liberating the 16th Grub.
The Grubfather will reward the Knight with Geo after liberating the 17th to 22nd Grubs (140 Geo for the 17th, 150 Geo for the 18th, 160 Geo for the 19th, 165 Geo for the 20th, 170 Geo for the 21st, and 180 Geo for the 22nd Grub found).
The Grubfather will give the Knight a Hallownest Seal after freeing half (23) of the total Grubs, and the Grubfriend Achievement will be unlocked.
The Grubfather will reward the Knight with Geo after liberating the 24th to 30th Grub (200 Geo for the 24th, 200 Geo for the 25th, 205 Geo for the 26th, 210 Geo for the 27th, 215 Geo for the 28th, 220 Geo for the 29th, and 220 Geo for the 30th Grub found).
The Grubfather will reward the Knight with a Pale Ore for liberating the 31st Grub.
The Grubfather will reward the Knight with Geo after liberating the 32nd to 37th Grubs (230 Geo for the 32nd, 235 Geo for the 33rd, 240 Geo for the 34th, 245 Geo for the 35th, 250 Geo for the 36th, and 255 Geo for the 37th Grub found).
The Grubfather will give the Knight a King’s Idol for liberating the 38th Grub.
The Grubfather will reward the Knight with Geo after liberating the 39th to 45th Grub (260 Geo for the 39th, 265 Geo for the 40th, 270 Geo for the 41st, 280 Geo for the 42nd, 290 Geo for the 43rd, 295 Geo for the 44th, and 300 Geo for the 45th Grub found).
After liberating all of the Grubs in Hallownest, the Grubfather will reward the Knight with the Grubberfly’s Elegy Charm, which allows the Knight to launch projectiles when attacking with the Nail and when at full health, as well as unlocking the Metamorphosis Achievement.

This guide will teach you how to find all the Grubs in the Watcher’s Spire!

Watcher’s Spire Grub

A screenshot of the location of the Grub in the Watcher's Spire

There is only one Grub in the Watcher’s Spire area, and it can be found in the leftmost part of a room near the middle of the Watcher’s Spire, which is a sub-area in the middle of the City of Tears.

The Knight will encounter various enemies in Watcher’s Spire, but the Knight will specifically encounter a Winged Sentry and a Lance Sentry on the way to the Grub in the Watcher’s Spire.

Before the Knight can find the stated Grub, he must first learn the Mantis Claw ability, which allows the Knight to cling to walls and jump off them. Furthermore, it is recommended that the Knight have the Monarch Wings ability, which allows the Knight to do a double jump in mid-air, and the Mothwing Cloak ability, which allows the Knight to rush forward to navigate Watcher’s Spire more easily. Finding the Grub in the Watcher’s Spire will be a piece of cake with these abilities.

To find the Grub in Watcher’s Spire, this is what the Knight must do:

Starting from the Bench on the western part of the Watcher’s Spire, head to the right to exit the room, jump across the gap, continue heading to the right, drop down the platform, jump across a shaft, jump across another gap, head to the right, then take the exit on the top right corner of the room.
Next, head up the wall on the right with the help of the Mantis Claw ability, where the Knight will encounter a Winged Sentry, jump towards the platform on the left, head to the left, and ride the elevator up.
Then, head to the right, take the exit above, head up the shaft with the help of the Mantis Claw ability, head to the left at the top, and then drop to an open area where the Knight will encounter a Lance Sentry.
After that, head to the left, and at the end of the path, the Knight will find a Grub trapped inside a glass jar! The Knight can now strike the glass jar to break it and free the Grub!

After finding the Grub in the Watcher’s Spire, the Knight is one step closer to finding them all, receiving the Grubberfly’s Elegy Charm and unlocking the Metamorphosis Achievement!