How to beat Nightmare King Grimm?

Learning how to beat Nightmare King Grimm requires mastering one of Hollow Knight's most challenging boss fights through precise timing, pattern recognition, and strategic positioning.

Understanding Nightmare King Grimm's Attack Patterns

Nightmare King Grimm has six main attack sequences that you must learn to counter effectively. His flame pillar attack creates vertical columns of fire that can be avoided by staying mobile. The dash-slash combo requires quick reflexes—jump over Grimm as he dashes toward you, then immediately move away from his follow-up slash.

The uppercut attack is telegraphed by Grimm crouching low. Jump and air-dash away to avoid the flames that erupt upward. His aerial dive bomb creates a shockwave, so position yourself at the screen's edges when you see him rise high.

Essential Combat Strategies

Recommended Charm Build

Equip Quick Slash for faster attack speed, Mark of Pride for extended reach, and Sharp Shadow to deal damage while dash-dodging through Grimm. Grubsong provides soul generation when you inevitably take damage.

Positioning and Movement

Stay grounded whenever possible—Grimm punishes aerial players heavily. Use your dash primarily for dodging, not positioning. When Grimm performs his flame bat attack, stand still and let the bats pass overhead rather than panicking and moving into them.

Key Tips for Victory

Focus on getting 1-2 hits per opening rather than being greedy. Grimm's pufferfish attack (flame spheres) can be navigated by walking slowly between the projectiles. During his stagger phase, position yourself slightly behind him for maximum damage output with your nail.

Patience is crucial—this fight rewards careful observation over aggressive play. With practice, you'll recognize each attack's audio and visual cues, making victory achievable. Consider practicing against regular Grimm first to familiarize yourself with similar attack patterns before attempting this ultimate challenge.