Grimm, a captivating character in Hollow Knight, presents two formidable challenges: Troupe Master Grimm and Nightmare King Grimm. These battles demand precision, reflexes, and strategic charm selection. All builds necessitate the Grimmchild charm (occupying two charm notches).

This fight introduces Grimm's moveset. It's a fast-paced dance requiring calculated attacks. These builds offer effective strategies:
1. Nail Build:

This build maximizes nail damage between Grimm's attacks. Quick Slash enables efficient hit combos. Unbreakable/Fragile Strength is crucial for damage increase. Longnail, a suitable alternative to Mark of Pride (considering Grimmchild's two-notch cost), extends nail range for crucial hits during Grimm's attack animations.
2. Spell Build:

For spell-focused players, this build shines. Shaman Stone significantly boosts spell damage, synergizing with Spell Twister for rapid spell casting. Grubsong maintains soul reserves, and Unbreakable/Fragile Heart provides extra mask health for sustained spell usage.
Defeating Troupe Master Grimm unlocks the final charm notch, crucial for Nightmare King Grimm builds.

Nightmare King Grimm is significantly harder, dealing double damage and moving much faster. His new flame pillar attack presents both a threat and an opportunity for burst damage.
1. Hybrid Nail/Spell Build:

A pure nail build is inefficient here. This hybrid approach utilizes powerful spells (Abyss Shriek and Descending Dark) alongside nail attacks. Shaman Stone remains essential for spell damage amplification, while Unbreakable/Fragile Strength and Mark of Pride boost nail damage during opportune moments.
2. Defensive Spell/Nail Art Build:

This defensive build emphasizes spells and nail arts, incorporating evasion techniques. Shaman Stone and Spell Twister remain core for damage output, while Grubsong ensures consistent soul supply. Sharp Shadow (requiring Shade Cloak) allows for dashing through attacks, and Nailmaster's Glory significantly enhances nail art damage.
These builds provide effective strategies for overcoming both Grimm encounters. Remember to adapt your approach based on your playstyle and mastery of Hollow Knight's mechanics.