Hollow Knight is a massive game. As with any Metroidvania, there are a variety of secrets to discover and paths for you to take on your journey, allowing you to experience every corner of this strange world of bugs and monsters.
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Every so often, you may come across these poor little Grubs trapped in glass jars dotted around the map. One can usually identify them by the sound of their whimpering, and freeing them can result in some neat prizes. Here's a complete look at all the rewards you can earn for helping out.
Rare Items
There are a total of 46 Grubs scattered throughout the game, and you must rescue all of them in order to get the full benefit of the rewards. This task becomes much less daunting once you obtain the Grub Map, but you can still easily find Grubs before obtaining it and receive at least something from the Grubfather. The exact rewards received vary by the number of Grubs saved:
| Grubs Saved | Item Reward | Item Use |
|---|---|---|
| 5 | Mask Shard | Collect four to increase your maximum health |
| 10 | Grubsong Charm | Gain SOUL when you take damage |
| 16 | Rancid Egg | Give to Confessor Jiji to summon a lost Shade |
| 23 | Hallownest Seal | Can be sold for about 450 Geo |
| 31 | Pale Ore | Used to upgrade your Nail |
| 38 | King's Idol | Can be sold for about 800 Geo |
| 46 | Grubberfly's Elegy Charm | Lets you shoot a projectile when your health is full |
Geo in Abundance
In addition to items, you will also receive Geo for rescuing certain numbers of Grubs. The exact amount of Geo earned varies and goes up as you rescue more and more Grubs, adding up to a total of 6,750 Geo. This table will display the Geo analogous to the number of Grubs rescued, as well as the items that are given for a certain amount.
| Grubs | Geo/Items | Grubs | Geo/Items | Grubs | Geo/Items |
|---|---|---|---|---|---|
| 1 | 10 | 17 | 140 | 33 | 235 |
| 2 | 20 | 18 | 150 | 34 | 240 |
| 3 | 30 | 19 | 160 | 35 | 245 |
| 4 | 40 | 20 | 165 | 36 | 250 |
| 5 | Mask Shard | 21 | 170 | 37 | 255 |
| 6 | 50 | 22 | 180 | 38 | King's Idol |
| 7 | 60 | 23 | Hallownest Seal | 39 | 260 |
| 8 | 70 | 24 | 200 | 40 | 265 |
| 9 | 80 | 25 | 200 | 41 | 270 |
| 10 | Grubsong Charm | 26 | 205 | 42 | 280 |
| 11 | 90 | 27 | 210 | 43 | 290 |
| 12 | 100 | 28 | 215 | 44 | 295 |
| 13 | 110 | 29 | 220 | 45 | 300 |
| 14 | 120 | 30 | 220 | 46 | Grubberfly's Elegy Charm |
| 15 | 120 | 31 | Pale Ore | ||
| 16 | Rancid Egg | 32 | 230 |
Achievements
Finally, rescuing Grubs can add to your list of achievements. Achievements serve as markers of a player's skill and the milestones they reached as they progress through the game. They are only given after a certain set of conditions are met, and while some are exclusive to one save file, the two that are obtained by finding and rescuing Grubs are not:
| Name | How to Earn |
|---|---|
| Grubfriend | Rescue half of the Grubs (23/46) |
| Metamorphosis | Rescure every Grub (46/46) |