Grub

Grubs are creatures found trapped in glass jars throughout Hallownest. They can be freed from their jar after which the Grubfather will grant a reward for each Grub that is saved.

When close enough to their location, a faint crying noise can be heard in their general direction. The Grubs talk in high-pitched babbles and cannot be listened to.

They can be freed by breaking the jar with the Nail, after which the Grub will burrow into the ground and return to the Grubfather. Obtaining the Collector's Map after beating the Collector shows the locations of unfreed Grubs.

There are 46 Grubs to be found in total. Rescuing 23 Grubs rewards the Grubfriend achievement while rescuing the last Grub unlocks the Metamorphosis achievement.

Locations
Trapped Grubs can be found all across Hallownest.

{| class="article-table mw-collapsible mw-collapsed" width="100%" ! colspan="4" |

Rewards
!Number !Location !Requires !Reward and Mantis Claw Crystal Heart and
 * colspan="4" |Rewards are based on the total number of Grubs saved, not which Grubs have been saved.
 * colspan="4" |Rewards are based on the total number of Grubs saved, not which Grubs have been saved.
 * 1
 * Forgotten Crossroads
 * 2
 * Forgotten Crossroads
 * 3
 * Forgotten Crossroads
 * Breakable wall
 * 4
 * Forgotten Crossroads
 * Spike bounce
 * 5
 * Forgotten Crossroads
 * Mothwing Cloak (or nail bounce)
 * Mask Shard
 * 6
 * Greenpath
 * 7
 * Greenpath
 * 8
 * Greenpath
 * Defeat Moss Knight
 * 9
 * Greenpath
 * Mothwing Cloak
 * 10
 * Fungal Wastes
 * Mothwing Cloak
 * Grubsong
 * 11
 * Fungal Wastes
 * Mantis Claw
 * 12
 * City of Tears
 * 13
 * City of Tears
 * 14
 * City of Tears
 * Desolate Dive
 * 15
 * City of Tears
 * 16
 * City of Tears
 * Monarch Wings (or nail bounce)
 * Rancid Egg
 * 17
 * Crystal Peak
 * Mothwing Cloak
 * Fungal Wastes
 * Mothwing Cloak
 * Grubsong
 * 11
 * Fungal Wastes
 * Mantis Claw
 * 12
 * City of Tears
 * 13
 * City of Tears
 * 14
 * City of Tears
 * Desolate Dive
 * 15
 * City of Tears
 * 16
 * City of Tears
 * Monarch Wings (or nail bounce)
 * Rancid Egg
 * 17
 * Crystal Peak
 * Mothwing Cloak
 * 15
 * City of Tears
 * 16
 * City of Tears
 * Monarch Wings (or nail bounce)
 * Rancid Egg
 * 17
 * Crystal Peak
 * Mothwing Cloak
 * Monarch Wings (or nail bounce)
 * Rancid Egg
 * 17
 * Crystal Peak
 * Mothwing Cloak
 * Mothwing Cloak
 * 18
 * Crystal Peak
 * Crystal Heart
 * 19
 * Crystal Peak
 * Monarch Wings (or nail bounce)
 * 20
 * Crystal Peak
 * Crystal Heart
 * 21
 * Crystal Peak
 * Mothwing Cloak
 * 22
 * Crystal Peak
 * 23
 * Crystal Peak
 * Platforming
 * Hallownest Seal
 * 24
 * Resting Grounds
 * Desolate Dive
 * 25
 * Royal Waterways
 * 26
 * Royal Waterways
 * Crystal Heart
 * 27
 * Royal Waterways
 * Isma's Tear
 * 28
 * Howling Cliffs
 * Mantis Claw
 * 29
 * Kingdom's Edge
 * Desolate Dive
 * 30
 * Kingdom's Edge
 * Mantis Claw
 * 31
 * Fog Canyon
 * Crystal Heart
 * Pale Ore
 * 32
 * Queen's Gardens
 * 33
 * Queen's Gardens
 * Mantis Claw,
 * 27
 * Royal Waterways
 * Isma's Tear
 * 28
 * Howling Cliffs
 * Mantis Claw
 * 29
 * Kingdom's Edge
 * Desolate Dive
 * 30
 * Kingdom's Edge
 * Mantis Claw
 * 31
 * Fog Canyon
 * Crystal Heart
 * Pale Ore
 * 32
 * Queen's Gardens
 * 33
 * Queen's Gardens
 * Mantis Claw,
 * Fog Canyon
 * Crystal Heart
 * Pale Ore
 * 32
 * Queen's Gardens
 * 33
 * Queen's Gardens
 * Mantis Claw,
 * 33
 * Queen's Gardens
 * Mantis Claw,
 * Mantis Claw,

Monarch Wings (or nail bounce) and Monarch Wings & Isma's Tear Monarch Wings (or nail bounce) Grubberfly's Elegy
 * 34
 * Queen's Gardens
 * Mantis Claw
 * 35
 * Deepnest
 * Breakable wall
 * 36
 * Deepnest
 * Breakable wall
 * 37
 * Deepnest
 * Crystal Heart
 * 38
 * Deepnest
 * King's Idol
 * 39
 * Deepnest
 * 40
 * Ancient Basin
 * Mothwing Cloak
 * 38
 * Deepnest
 * King's Idol
 * 39
 * Deepnest
 * 40
 * Ancient Basin
 * Mothwing Cloak
 * Deepnest
 * 40
 * Ancient Basin
 * Mothwing Cloak
 * 40
 * Ancient Basin
 * Mothwing Cloak
 * 41
 * Ancient Basin
 * Desolate Dive
 * 42
 * The Hive
 * Desolate Dive
 * 42
 * The Hive
 * Desolate Dive
 * Desolate Dive
 * 43
 * The Hive
 * Crystal Heart and
 * The Hive
 * Crystal Heart and
 * 44
 * Tower of Love
 * Love Key
 * 45
 * Tower of Love
 * Love Key
 * 46
 * Tower of Love
 * Love Key
 * Love Key
 * 46
 * Tower of Love
 * Love Key
 * Tower of Love
 * Love Key
 * }

Trivia

 * It is possible to come across a Grub Mimic trapped in a glass jar that will transform and become hostile when freed. The easiest way to check if it is an actual Grub is to Dream Nail them. Grubs will always say "...Home..." but Grub Mimics will say "...Kill...", "...Empty... " or "...Other...".
 * Within the Tower of Love, there is a secret area that can be accessed by jumping into a hidden gap within the ceiling along the hallway of the Grubs. This reveals a mysterious piece of art known only as the "Vitruvian Grub" in the game's files.
 * Grubs were designed by Makoto Koji, the voice actress of Hornet and various other female characters. The Grubs were voiced by William Pellen.

References