Grimm Troupe (Quest)

The Grimm Troupe's Quest is Troupe Master Grimm's request to help the Troupe's Ritual in Hallownest. It has two possible endings, with different rewards, achievements, and characters involved. The two endings are mutually exclusive.

Quest Outline
Summoning The Grimm Troupe In order to start the quest, the Knight must first travel to the Howling Cliffs and go through two breakable walls (marked by circles on the map to the right), then find "The corpse of a large bug" by travelling to the end of a short corridor and through another small hidden gap to the room where it lies (marked with an arrow on the map). After Dream Nailing the corpse, the previous room must be returned to, where the torch is now lit. By striking the brazier at the foot of the torch multiple times a small cutscene triggers, showcasing the Nightmare Lantern Interlude.

Grimm and the Grimmchild When returning to Dirtmouth, two tents of the Grimm Troupe have appeared, with the larger one containing Grimm. Speaking with Grimm grants the Grimmchild Charm, and, as long as it is equipped, it is possible to fight the Grimmkin, scattered across Hallownest and take their flames (marked on the Knight's Map).

The first Grimmkin fought are the Novices, and once all three are defeated, returning to Grimm upgrades the Grimmchild and allows for fighting the next Grimmkin, the Masters. Defeating these and returning to Grimm initiates the Troupe Master Grimm boss fight. Defeating Grimm upgrades the Grimmchild once again, grant the Grand Performance achievement, and a Charm Notch, and allows the Knight to find and fight the final Grimmkin, the Nightmares.

Brumm and the Nightmare King The final phase of the Ritual has not three but four flames scattered around Hallownest. One of those four flames is carried by Brumm in Deepnest. When listened to, Brumm will suggest breaking the cycle of the Ritual and banishing the Troupe from Hallownest. He then tells the Knight that if they so wish, they should meet him where it all began.

Returning to Grimm's tent with three flames collected and Dream Nailing the sleeping Grimm initiates the Nightmare King Grimm boss fight. Defeating the Nightmare King completes the Ritual in Hallownest, granting the Ritual achievement. The Grimmchild is upgraded one final time, and the Troupe leaves Hallownest, with the exception of Divine, who stays behind until all Fragile Charms (Heart, Greed, and Strength) are made Unbreakable.

If instead Brumm is approached at the Howling Cliffs, the Knight can help him destroy the Nightmare Lantern and banish the Troupe. Doing so removes the Grimmchild Charm from the inventory and grants the Banishment achievement. Returning to Dirtmouth reveals the presence of a new NPC, Nymm, while the entire Troupe is nowhere to be found. Speaking to Nymm grants the Carefree Melody Charm, which takes up the same slot in the inventory as Grimmchild.

Achievements
La Troupe Grimm (Quête)