Grimmchild

After defeating Nightmare King Grimm:

Usefulness
The Grimmchild summons a Grimmchild familiar that grows stronger as the charm progresses through its phases. In order to level up the Grimmchild through its phase, the player must explore and locate flames indicated on the map, and by doing so the player will have to face down a Grimmkin enemy. After defeating the enemy an animation will occur and the Grimmchild will have "consumed a flame". It also allows the Knight to activate both boss fights as it is needed to fight Troupe Master Grimm and to Dream Nail Grimm when he is sleeping in order to fight Nightmare King Grimm.

How to Acquire
Given by Grimm after the Grimm Troupe has been summoned.

Trivia

 * When resting at a bench, the Grimmchild companion will rest on the ground beside the Knight.
 * If the Knight is too far from the Grimmchild, there will be a short animation of it teleporting back to the Knight.
 * Wearing Grimmchild will activate unique dialogue when speaking with the White Lady.
 * It is suggested that after Nightmare King Grimm has been defeated, the Grimmchild will eventually grow up to replace Grimm.