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The Grubfather is an elderly Grub found in the north-west corner of the Forgotten Crossroads. He will reward The Knight for each Grub found.

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Grubs

Grub

Grubs are NPCs found trapped in glass jars throughout Hallownest. They talk in high-pitched babbles and cannot be spoken to. When hit with the Dream Nail, they will say "...Home...". The player can free them by hitting the jar with their 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 in total.

Rewards

Number Location Requires Reward
1 Forgotten Crossroads - Geo‍10
2 Forgotten Crossroads - Geo‍20
3 Forgotten Crossroads Breakable wall Geo‍30
4 Forgotten Crossroads Spike bounce Geo‍40
5 Forgotten Crossroads Mothwing Cloak Mask Shard
6 Greenpath - Geo‍50
7 Greenpath - Geo‍60
8 Greenpath Defeat Moss Knight Geo‍70
9 Greenpath Mothwing Cloak Geo‍80
10 Fungal Wastes Mothwing Cloak Grubsong
11 Fungal Wastes Mantis Claw Geo‍90
12 City of Tears - Geo‍100
13 City of Tears - Geo‍110
14 City of Tears Desolate Dive Geo‍120
15 City of Tears - Geo‍120
16 City of Tears Monarch Wings Rancid Egg
17 Crystal Peak Mothwing Cloak

and Mantis Claw

Geo‍140
18 Crystal Peak Crystal Heart Geo‍150
19 Crystal Peak Monarch Wings Geo‍160
20 Crystal Peak Crystal Heart Geo‍165
21 Crystal Peak Mothwing Cloak Geo‍170
22 Crystal Peak - Geo‍180
23 Crystal Peak Platforming Hallownest Seal
24 Resting Grounds Desolate Dive Geo‍200
25 Royal Waterways - Geo‍200
26 Royal Waterways Crystal Heart

or Isma's Tear

Geo‍205
27 Royal Waterways Isma's Tear Geo‍210
28 Howling Cliffs Mantis Claw Geo‍215
29 Kingdom's Edge Desolate Dive Geo‍220
30 Kingdom's Edge Mantis Claw Geo‍220
31 Fog Canyon Crystal Heart Pale Ore
32 Queen's Gardens - Geo‍230
33 Queen's Gardens Everything Geo‍235
34 Queen's Gardens Mantis Claw Geo‍240
35 Deepnest Breakable wall Geo‍245
36 Deepnest Breakable wall Geo‍250
37 Deepnest Crystal Heart Geo‍255
38 Deepnest - King's Idol
39 Deepnest - Geo‍260
40 Ancient Basin Mothwing Cloak

and Monarch Wings

Geo‍265
41 Ancient Basin Desolate Dive Geo‍270
42 The Hive Desolate Dive

& Isma's Tear

Geo‍280
43 The Hive Desolate Dive,

Isma's Tear &

Monarch Wings

Geo‍290
44 Tower of Love Love Key Geo‍295
45 Tower of Love Love Key Geo‍300
46 Tower of Love Love Key Grubberfly's Elegy
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Dream Nail Dialogue

Happy...happy...happy!!!

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Trivia

  • Occasionally the player will come across a Grub Mimic trapped in a glass jar that will transform and become hostile when freed. The easiest way to check is to Dream Nail them. Grubs will always say "...Home..." but Grub Mimics will say "...Kill...", "...Empty... " or "...Other...".
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  • Upon receiving the final reward(s) from the Grubfather, if the player rests at a bench and returns, they will find the Grubfather has swallowed all of the Grubs and is laying engorged on the floor. The grubs' babbling can still be heard from inside him, indicating they are alive.
    • It is unknown whether this is a cruel act on the Grubfather's part or just a part of Grub biology. The achievement the player earns after turning in all Grubs is called "Metamorphosis," and the charm references a "Grubberfly" - this may imply that the Grubs are simply larval stage for a butterfly- or moth-like creature.