Dive Attack – Grimm will teleport in the air and dive towards you.

When Grimm dashes forward, you can jump over him and slash downwards or perform a Descending Dark to deal damage to him. That’s where you’ll want to position yourself. There are safe gaps on the ground between when the fireballs will land. At the peak of Grimm’s ascent, he will disappear and summon five fireballs to rain down on the arena.

Forward Slash – Grimm will dash and slash forward, and then launch into the air with an uppercut.

This should also allow you to get close enough to Grimm to damage him. Simply jump over the bats and towards Grimm to avoid receiving damage.

Fire Bats – Grimm will open up his cloak and fire three fire bats at you.

The attack will end after Grimm fires 12 sets of fireballs. What you’ll need to do is to jump to avoid the fireballs. The fireballs come in ones or twos and are fired consecutively, leaving a space between them. He will hover in the middle of the arena, puff up, and spew sets of fireballs towards both directions of the arena.

Fireball Barrage – This will always be Grimm’s first attack.

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

Returning to Grimm's tent with three flames collected and Dream Nailing the sleeping Grimm initiates the Nightmare King Grimm boss fight. He then tells the Knight that if they so wish, they should meet him where it all began. When listened to, Brumm will suggest breaking the cycle of the Ritual and banishing the Troupe from Hallownest. One of those four flames is carried by Brumm in Deepnest. The final phase of the Ritual has not three but four flames scattered around Hallownest. 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. Defeating these and returning to Grimm initiates the Troupe Master Grimm boss fight. 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. 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). When returning to Dirtmouth, two tents of the Grimm Troupe have appeared, with the larger one containing Grimm.

Hollow knight grimm