Skip to content
Fog Canyon
Hollow Knight

Fog Canyon

Navigate Fog Canyon in Hollow Knight: find Hallownest Seals, a Charm Notch, the Howling Wraiths spell, and defeat the boss Uumuu.

By ···10 min read·Multi-source verified
1 reading this guide  

Navigate Fog Canyon in Hollow Knight: find Hallownest Seals, a Charm Notch, the Howling Wraiths spell, and defeat the boss Uumuu.

Walkthrough
  1. 1
    Upon entering Fog Canyon, travel to the highest point and reveal a hidden path to the left.
  2. 2
    Descend to the bottom platform to collect a Hallownest Seal.
  3. 3
    Take the exit below the Hallownest Seal.
  4. 4
    In the next screen, navigate through exploding bubble eggs to reach the bottom left side and acquire a Charm Notch.
  5. 5
    Exit this screen the same way you entered.
  6. 6
    Drop down until you find an exit to the left and take it.
  7. 7
    Follow the platforms upwards to the top left.
  8. 8
    Listen for Cornifer's humming and purchase the map.
  9. 9
    Return to the previous screen and take the bottom left exit.
  10. 10
    Reach the Teacher's Archives screen.
  11. 11
    From the top right ledge, use Super Dash to reach a Grub.
  12. 12
    Speak with Quirrel outside the Teacher's Archives.
  13. 13
    Enter the building and proceed all the way right.
  14. 14
    Use the Bench located above to prepare for the boss fight before dropping through the hole.
  15. 15
    Descend to the bottom of the building to confront Uumuu.
  16. 16
    After the fight, explore the area to find a tank full of lightning, which adds an entry for 'Charged Lumafly' to your Hunter's Journal.
  17. 17
    Proceed to the bottom left side of the screen and locate a large water tank.
  18. 18
    Climb to the top of the tank and inspect it; Quirrel will appear.
  19. 19
    After the cutscene (a non-interactive cinematic the game plays automatically), use the Dream Nail on the spirit within the tank.
  20. 20
    Inside the dream world, strike the spirit multiple times and use Focus to achieve the 'Teacher Achievement'.
  21. 21
    Exit the Teacher's Archives.
  22. 22
    Go left from the building and break the scaffolding to proceed.
  23. 23
    Open your map and note the path leading to Greenpath.
  24. 24
    Travel to the Greenpath screen and take the path to the left.
  25. 25
    Take the first upward path you encounter, which leads to a Lifeblood Cocoon and another Hallownest Seal.
  26. 26
    Return to the previous room and continue left.
  27. 27
    Take the path upwards and navigate to the other side to break more scaffolding.
  28. 28
    Go to the leftmost area and enter the building leading to Overgrown Mound.
  29. 29
    Inside, reach the top right side, at which point the gates will close.
  30. 30
    Defeat the enemies that appear.
  31. 31
    Proceed to the rightmost side and use the Howling Wraiths spell.
  32. 32
    Break the scaffolding to your left and exit Fog Canyon through the passage to Greenpath.

Boss Tactics: Uumuu

Uumuu has two primary attacks, both involving spawning lightning bursts on the screen. One attack scatters lightning randomly, while the other targets your position. Uumuu is invulnerable for most of the fight, only becoming vulnerable when Quirrel intervenes and attacks. This limited window means few hits can be landed, making soul collection difficult. To manage soul, equip the Grubsong Charm. The Quick Focus Charm is highly recommended due to the minimal time available for Focusing (healing).

Tips
  • When you first enter Fog Canyon, go all the way up to reveal a hidden path to the left.
  • The Charm Notch is located in a room filled with bubble eggs that explode on contact.
  • Cornifer can be found by following his humming sound.
  • The Grub is accessible via Super Dash from a ledge in the Teacher's Archives.
  • Prepare for the Uumuu boss fight by using the Bench above the arena in the Teacher's Archives.
  • Equip the Quick Focus Charm for the Uumuu fight to maximize healing opportunities.
  • Equip the Grubsong Charm to regain soul when hit, as you will land few direct hits on Uumuu.
  • After defeating Uumuu, inspect the large water tank to trigger a scene with Quirrel.
  • Use the Dream Nail on the spirit in the tank to enter a dream world and obtain the 'Teacher Achievement'.
  • The Howling Wraiths spell is found in the Overgrown Mound area.
  • Charm Notch
  • Hallownest Seal x2
  • Grub
  • Howling Wraiths (spell)
  • 'Teacher Achievement' (in dream world)
  • Charged Lumafly entry in Hunter's Journal

100% Human-Written. AI Fact-Checked. Community Verified. Learn how AntMag verifies content