The aging Grub patriarch in the Forgotten Crossroads Grubhome who weeps for his 46 missing children, hands out per-Grub rewards as they return, and bloats into a Grubberfly metamorphosis at the end.
Grubfather is the most cleanly hopeful NPC in Hollow Knight. According to the wiki, he is an elderly Grub patriarch who weeps in the Grubhome at the northwest corner of the Forgotten Crossroads because all 46 of his children have been taken from their dens and trapped in glass jars across Hallownest by the Collector.
Per the wiki, returning each rescued Grub triggers a milestone reward: Geo at low counts, then Mask Shards, Charm Notches, Pale Ore, Rancid Eggs, and finally Grubsong at 10, Grubberfly's Elegy at 46. The wiki frames the questline as a Hallownest scavenger hunt that pays out the entire run if completed: 46 rewards across 46 Grub jars.
The wiki specifies the finale beat in detail. "After all Grubs have been rescued and the rewards collected, returning to Grubfather reveals that all the Grubs are gone from their holes, and Grubfather is now lying in the centre of the room, his stomach extremely bloated. The muffled noises of Grub chatter can be heard from inside him." The wiki notes this is the Grub life cycle: the brood metamorphoses inside him into a Grubberfly.
This guide covers Grubfather's Grubhome location in the northwest Crossroads, the full milestone reward table (Mask Shards, Pale Ore, Charm Notches, Grubsong, Grubberfly's Elegy), the metamorphosis scene at 46/46, the "Happy...happy...happy!!!" Dream Nail line, and the in-fiction Collector connection that explains how the whole brood ended up locked in jars.
Grubfather, the elderly Grub patriarch in the Forgotten Crossroads Grubhome.
His 46 missing Grubs returned, all trapped in jars across Hallownest by the Collector.
Grubsong at 10 Grubs, 
Grubberfly's Elegy at 46.
Bloated metamorphosis after all 46 are returned: the Grubs become a Grubberfly inside him.Grubfather is the aging patriarch of an entire Grub colony 
. Per the wiki, "Grubfather is the aging patriarch of a colony of Grubs who make their home in a room in the Forgotten Crossroads. Grubs are harmless creatures who have a good sense of direction and are highly skilled tunnellers. They are known to collect shiny things 
in their burrows, such as Geo and Relics."
According to the wiki, every one of his 46 children has been taken. "Due to mysterious reasons, all of Grubfather's children disappeared. The Grubs can be found trapped in jars in various locations throughout Hallownest, locked there by the Collector." The Knight breaks each jar with the Nail; the freed Grub burrows into the ground and returns home automatically.
The wiki specifies that when the Knight first meets him, "he is crying as all the Grubs have been taken from their dens. When returning after freeing Grubs, Grubfather grants rewards such as Geo and other items according to how many Grubs have been saved." Each rescue is acknowledged immediately and the reward is handed over before the Knight leaves the room.
Grubfather's room sits in the northwest corner of the Forgotten Crossroads. Per the wiki, "Grubfather is found in the northwest corner of the Forgotten Crossroads in a room full of small Grub dens; this room is referred to as the Grubhome in an official map." The dens are the small alcoves in the walls where the Grubs normally live; on a fresh run they are all empty.
According to the wiki, the room itself is non-hostile. There are no enemies inside the Grubhome and no platforming gates between the entrance and Grubfather himself. The Knight walks straight in, hears the crying, and is offered the reward sequence on contact.
The wiki notes that the Grubhome refills as the Knight rescues Grubs. Each returned Grub appears in one of the dens around the room, so the room visually changes from empty-and-quiet to crowded-and-chattering as the count climbs. After multiple visits, the Grubhome is the only NPC room in Hallownest whose population grows over the course of a single playthrough.
Combine Grub rescues with normal area exploration. Per the wiki, each Grub jar pings a faint crying noise when the Knight is close, so the audio cue doubles as a "you missed something in this room" flag. In actual play, the Grub hunt finishes itself on a normal 112%-paced exploration run; no dedicated farm visit is needed before the Collector fight unlocks the Grub-locating map.
Grubfather hands out rewards on fixed milestone counts. Per the wiki, the rewards escalate from small Geo drops to the run-defining Grubsong and Grubberfly's Elegy charms.
| Grubs returned | Reward | What it does |
|---|---|---|
| 1 | Geo (small) | Starter reward, low-Geo bracket |
| 5 | Mask Shard | One quarter of a new Mask |
| 10 | Grubsong Charm | SOUL per damage taken |
| 15 | Pale Ore | One of six required for Pure Nail |
| 20 | Hallownest Seal | Lemm relic, 450 Geo on resale |
| 23 | Grubfriend achievement unlocks | Halfway milestone |
| 25 | King's Idol | Lemm relic, 800 Geo on resale |
| 31 | Charm Notch | Extra Charm slot |
| 38 | Pale Ore | Second Pale Ore drop |
| 40 | Rancid Egg | Trade currency for Confessor Jiji |
| 46 | Grubberfly's Elegy + Metamorphosis | Full-HP nail beam Charm |
According to the wiki, the two capstone rewards carry the whole questline. Grubsong at 10 rescues is the build-defining sustain Charm for any no-Lifeblood run; it grants SOUL on hit-taken. Grubberfly's Elegy at 46 fires Nail beams while the Knight is at full Masks, which is the in-fiction reward for completing the entire Grub hunt.
The Grubs did not wander off on their own. Per the wiki, every Grub jar in Hallownest was placed there by the Collector, the secret dream boss in the Tower of Love. The wiki specifies that "the Grubs can be found trapped in jars in various locations throughout Hallownest, locked there by the Collector."
According to the wiki, defeating the Collector unlocks the Collector's Map, which "shows the locations of unfreed Grubs on purchased Maps." The Collector fight is therefore the practical halfway point of the Grub hunt: the first 20-30 Grubs are usually found incidentally during exploration, and the remaining 16-26 come from the Map sweep after the Collector falls.
The wiki notes the lore beat directly. The Collector hoards living Grubs in glass jars; Grubfather waits at home for the brood to return. The two NPCs sit at the opposite ends of the same questline, and the Knight is the mechanism that resolves it. After a few runs, this is the cleanest "small good thing in a dying kingdom" beat in the game.
The finale of the Grub questline is one of the game's most distinct cutscenes. Per the wiki, "after all Grubs have been rescued and the rewards collected, returning to Grubfather reveals that all the Grubs are gone from their holes, and Grubfather is now lying in the centre of the room, his stomach extremely bloated. The muffled noises of Grub chatter can be heard from inside him."
According to the wiki, "this appears to be part of the life cycle of Grubs where they will metamorphose into a Grubberfly." The Grubfather is not dying; he is gestating the next form. The Knight has no further interaction prompt with him after this point.
The wiki specifies that the scene also triggers the Metamorphosis achievement, which is paired with the Grubberfly's Elegy reward. In real runs, the metamorphosis scene is the in-game payoff that recasts the entire Grub-rescue arc: every freed Grub was not just a reward unlock, it was a contribution to the brood's rebirth as a single Grubberfly.
Grubfather's Dream Nail dialogue is the shortest in the game. Per the wiki, the line returned is simply:
According to the wiki, the three repetitions are the entire interior monologue. There is no philosophical lament like the Dreamers, no lore drop like the Midwife, no scheming like Sly. Grubfather is plainly happy that his children are coming home, and the Dream Nail confirms it in three words.
The wiki specifies that the Dream Nail line does not change between low and high Grub counts. Even when only a handful of Grubs have been rescued, the response is the same three-word chant. After multiple runs, this is the cleanest emotional baseline NPC in the game: the one character whose Dream Nail reading is unqualified and not weighed down by the Infection or the Seals.
Grubfather ties into the 46-Grub hunt, the Collector fight, and the Grubberfly's Elegy unlock chain. These spokes pick up the connected threads.
Game data and screenshots adapted from hollowknight.fandom.com, used under CC BY-SA 3.0. Original content remains the property of the wiki contributors and Team Cherry.