In the sprawling, vertical kingdom of Pharloom, movement is as much a weapon as Hornet's needle itself. While the early game focuses on dashes and parries, reaching the mid-game milestones requires a fundamental shift in how you traverse the environment. The Clawline—often referred to by players as the grappling hook—is the most transformative Ancestral Art for this transition. It redefines aerial combat and allows Hornet to navigate the hazardous lava pits of the Underworks with predatory grace.

Finding the Clawline is not a simple task of walking into a room and opening a chest. It is a multi-stage journey that spans several of Pharloom's most complex regions, requiring specific keys and a mastery of existing movement tools.

Clawline Location Summary

The Clawline is located within a Weaver Burial Spire in The Cauldron, which is a high-temperature sub-area of the Underworks. To reach this altar, players must progress into Act 2 of Hollow Knight: Silksong and obtain the White Key to unlock the descent through the White Ward.

Prerequisites for Reaching the Underworks

Before you set your sights on the Underworks, ensure Hornet is equipped with the following core abilities. Attempting to reach the Cauldron without these will result in unavoidable death or hard-stuck progress:

  1. Drifter’s Cloak: Essential for gliding across the wide gaps and rising thermal currents in the Underworks.
  2. Cling Grip: Your standard wall-jump ability, required for the vertical shafts leading to the Weaver Burial Spire.
  3. Needolin: Required to bypass the barriers at the Grand Gate.

Additionally, you will need a significant amount of Rosaries (at least 220) if you fail to find the White Key naturally, as you may need to purchase it from the merchant Ju Bilana.

How to Get the White Key in Choral Chambers

The path to the Clawline is physically blocked by a sealed elevator in the lower-left tower of the Citadel. To activate it, you need the White Key.

Exploring the Songclave

The White Key is hidden in the Songclave, situated in the upper-right reaches of the Choral Chambers. This area is filled with musical-themed puzzles and bell-ringing enemies.

  • Step-by-Step Path: From the central Choral Chambers bench, head right and ascend through the vertical chime-chambers. You will encounter Lace for a brief dialogue encounter before reaching a locked elevator marked with a surgical white symbol. Ignore the elevator for now and continue climbing right.
  • The Shrine Altar: At the far eastern edge of this region, you will find a quiet shrine. The White Key sits on the ground near the Weaver carvings.
  • Alternative Acquisition: If you have already progressed past certain world events and the key is no longer at the shrine, head to the wandering merchant Ju Bilana. She sells a replacement White Key for 220 Rosaries, though this is usually a backup for players who sequence-broke earlier sections.

Navigating the White Ward Descent

With the White Key in your inventory, return to the lower-left vertical shaft of the Choral Chambers. Interact with the white elevator panel to unlock the passage to the White Ward.

The White Ward is a transitional zone characterized by sterile, clinical aesthetics and mechanical precision. It serves as a vertical bridge. Drop down the central shaft, being careful to avoid the automated sentries. At the bottom, navigate left until you hit the boundary wall, then descend through the narrow passage into the eastern reaches of the Underworks.

Entering the Underworks and Reaching The Cauldron

The Underworks is Pharloom's industrial heart, a place of grinding gears and molten runoff. The atmosphere shifts here—the music becomes more percussive, and the environmental hazards increase significantly.

The Underworks Map

Upon entering, your first priority should be the map. From the entrance, head left to a small opening marked with a signpost to find the Map Maker. Having the map is crucial because the Underworks is a maze of similar-looking corridors and "ember floors" that deal contact damage.

The Path to The Cauldron

From the Underworks' main bench, follow these directions:

  1. Move left and locate the large wheel-like switch.
  2. Strike the switch repeatedly until the mechanism breaks, triggering a massive wind current directed upwards.
  3. Use your Drifter's Cloak to float into the upper chambers.
  4. Exit this vertical room to the left, then immediately begin a long descent toward the lower-right area.
  5. Watch for bomb-carrying flying enemies; they are designed to knock you into the lava pits below.

Surviving The Cauldron Gauntlet

Once you see the "The Cauldron" area title appear, the screen will take on a deep orange hue. This is the final stretch. The Cauldron is a platforming gauntlet where the floor is almost entirely lava.

The Lava Room Strategy

In the main chamber of the Cauldron, you must platform across several floating debris pieces. The lava here rises and falls in cycles.

  • Pro Tip: Do not rush your jumps. Wait for the lava to recede, then use a single jump followed by a Drifter's Cloak glide to maximize your air time.
  • The Final Lever: At the far right of the lava room, you will find a wall you can cling to. Climb up to find a hatch locked by a lever. Striking this lever opens the door to the Weaver Burial Spire.

Acquiring the Clawline Ancestral Art

Inside the spire, the heat subsides. You will find a large Weaver idol—an altar that looks like a stylized needle wrapped in silk. Interact with the altar to initiate a binding sequence. Hornet will absorb the energy, and the Clawline Ancestral Art will be added to your ability wheel.

Mastering Clawline Mechanics and Combat

The Clawline is not just a tool for movement; it is an aggressive combat modifier. Understanding its frame data and resource cost is key to surviving Act 2 bosses.

Traversal and The "Grapple Point"

Throughout Pharloom, you will notice metallic rings hanging from ceilings or embedded in walls.

  • Input: Press the Harpoon button (L2 on PlayStation, LT on Xbox, ZL on Switch, or S on PC).
  • Execution: Hornet launches her needle. If it hits a ring or a solid wall, she is instantly pulled toward it.
  • The Pull Reset: Reaching the target point resets Hornet’s dash and double-jump (if you have the Fay Down Cloak), allowing for infinite aerial chains if there are enough rings.

Combat Applications and Damage

When used on an enemy, the Clawline functions differently:

  • The Two-Hit Rule: The Clawline deals two instances of damage. The first hit occurs when the needle impacts the enemy. The second hit occurs when Hornet’s body collides with the target during the pull.
  • The 1 HP Protection: A unique mechanical detail in Silksong is that the initial harpoon hit is programmed not to kill an enemy if it would be a lethal blow. It leaves the enemy with 1 HP so that the "pull" and the second collision hit can execute. This ensures you always get the movement benefit and the silk replenishment.
  • Silk Economy: Using the Clawline consumes 1 strand of Silk. However, successfully striking an enemy with the harpoon replenishes a portion of your Silk bar. In mob fights, you can effectively use the Clawline for free by constantly cycling through targets.

Staggering Bosses

The Clawline is incredibly effective against flying bosses like Trobbio. The impact of the harpoon has a high "stagger value." Three consecutive Clawline hits will often force a boss into their tired animation, giving you a window to heal or use a heavy tool like the Sawbill.

Advanced Upgrades for the Clawline

Once you have the base ability, you can visit various smiths and shrines to enhance its properties. These upgrades are vital for the late-game "Greymoor" and "Citadel Heights" regions.

Upgrade Name Effect Location Requirements
Reinforced Claw Increases range to 20 meters and reduces cooldown. Termite Forge (Deep Docks) 300 Geo + 1 Pale Ore
Silk Pull Boost Allows pulling heavier enemies and adds a stun effect. Weaver’s Shrine (Greymoor) 5 Rosary Beads
Thorn Extension Adds 30% needle damage to the grapple collision. Citadel Blacksmith Post-Main Quest progress
Efficiency Mod Cuts Silk drain by 25% and extends chain duration. Far Shore Vendor 200 Geo (Variable)

Clawline vs. Other Ancestral Arts

While the Clawline is essential for traversal, how does it compare to other arts like the Silk Soar or Needle Strike?

  • Horizontal vs. Vertical: The Clawline is the king of horizontal gap-closing. While Silk Soar (the super-jump) is better for pure height, the Clawline allows for precision movement in tight corridors filled with spikes.
  • Utility: Unlike Needle Strike, which is purely offensive, the Clawline saves you from falling into pits. If you miss a platform in the Underworks, a quick flick of the harpoon toward a wall can save your run.

FAQ: Troubleshooting the Clawline Acquisition

Why can't I find the White Key in the Songclave?

If the key is missing from the shrine, you likely triggered a world-state change (such as defeating the Sentinel). Check the merchant Ju Bilana; she will have the key for sale in her "Special Items" tab.

Can the Clawline latch onto any surface?

It can latch onto most rock and metal surfaces, but it will slide off "slippery" surfaces like the mossy walls in Moss Grotto or the ice in certain sub-regions of the Citadel. Always look for the metallic rings for 100% reliability.

Does the Clawline use Silk even if I miss?

Yes. Every time you fire the harpoon, 1 strand of Silk is consumed regardless of whether you hit a target. Following the September 2025 patch, the cost remains the same, but the projectile speed was increased to make misses less frequent.

Summary of the Journey

Acquiring the Clawline is a rite of passage in Hollow Knight: Silksong. By navigating from the high bells of the Choral Chambers down into the molten depths of the Underworks, you earn more than just a tool—you earn the ability to treat the air as your own. Whether you are using it to stagger a boss or to zip across a room of lava in the Cauldron, the Clawline is the heartbeat of Hornet's advanced movement. Ensure you have your White Key ready and keep your Silk bar full as you descend into the industrial belly of Pharloom.