

Mask Maker provides 'faces' for the faceless of the Kingdom. For DRM Free players, a new version of Hollow Knight featuring the latest expansion will be made available through Humble Bundle at the same time. They provide lore on masks and on Hallownests history. We're talking about custom map markers, I thought that was obvious (this thread date is after that feature was added).

The Grubs talk in high-pitched babbles and cannot be listened to. You just have to buy the markers once you get your first map.

When close enough to their location, a faint crying noise can be heard in their general direction. For two, I had every map marker in the first hour of playing. They can be freed from their jar after which Grubfather grants a reward for each Grub that is saved. For Hollow Knight on the Nintendo Switch, a GameFAQs message board topic titled thought.
HOLLOW KNIGHT MAP MARKERS UPDATE
Grimm Troupe will arrive as a free update on Steam and GOG. Grubs are creatures found trapped in glass jars throughout Hallownest.
HOLLOW KNIGHT MAP MARKERS FULL
It also brings a welcome quality-of-life addition in the form of custom Map Markers. You must own the pins before they will show up in the map legend, and a full list is located in the Hollow Knight wikia. Grimm Troupe will introduce a new major quest line, new boss fights ("against a dark new foe and a twisted scarlet spectre"), new friendly NPCs and enemies, four new charms, and new music. You can quickly discover the ruins of White Palace in the eastern section of the Basin. It serves as the original location of the White Palace and also the home of the Pale King. "Take part in a twisted ritual that stretches the breadth of the kingdom", says Team Cherry, "and bestows the player with a powerful new ally!" This map will let you navigate the deepest part of the world where you will face off strange types of life-forms and different kinds of enemies. The latest expansion is a spooky, Halloween-themed offering that begins when you light the mysterious Nightmare Lantern, and summon the titular Grimm Troupe. By finding these lost and trapped Grubs in Hollow Knight, you can earn some fantastic rewards. The first, Hidden Dreams, arrived earlier this year. Grimm Troupe is the second free content expansion released for Team Cherry's beautiful, insect-themed Metroidvania game. Hollow Knight's next free expansion, Grimm Troupe, will launch on PC on October 26th, developer Team Cherry has announced.
