What to know

  • Curveclaw is a Red Tool in Silksong that behaves like a boomerang, useful against airborne enemies.
  • It is sold by Mottled Skarr (in Hunter’s March) for 140 Rosaries, or if you miss him, you can find the Curveclaw item near his corpse.
  • In Act 3, you can upgrade Curveclaw into Curvesickle, which has increased damage and a larger projectile.
  • To perform the upgrade, you need to use Curveclaw in a special “target practice” room in the Far Fields and hit all targets in a single throw; doing so triggers a friendly NPC who gives you the upgraded version.

Curveclaw expands your arsenal in Hollow Knight: Silksong by giving ranged coverage, particularly for flying enemies. While its baseline form is already quite handy, upgrading to Curvesickle turns it into an even more powerful tool for controlling space. Below is a full breakdown of how to get Curveclaw and the exact steps to upgrade it to Curvesickle.

How to get Curveclaw

Here’s how to get Curveclaw, even if you miss the original shop opportunity:

Step 1

Go to Hunter’s March.

Step 2

Buy Curveclaw from Mottled Skarr for 140 Rosaries.


Note: Skarr’s shop is hidden — to access it, you need the Drifter’s Cloak so you can ride air vents and reach the secret room.

Step 3

If you fail to buy it before Skarr dies (this happens when you move into Act 2), don’t worry: you can still recover the item. The Curveclaw tool will lie next to his corpse.

Step 4

Once you have it, equip it to a Red crest slot to start using it.

How to upgrade to Curvesickle (step-by-step)

Upgrading Curveclaw isn’t done via a vendor — it’s a hidden upgrade tied to a special challenge. Here’s a detailed guide:

Step 1: Progress until Act 3

You won’t be able to upgrade until the story advances into Act 3.

Step 2: Travel to Far Fields, reach the Bellway station there

You’ll need to find the target practice room located above the Far Fields Bellway station.

Step 3: In the target practice room, hit all targets in a single throw

This is the critical part: using Curveclaw, you must hit every target in the room with one throw (i.e., with a single curveclaw shot).

Step 4: The act triggers a friendly NPC event

Once you succeed in Step 4, a friendly Mottled Skarr Scout appears and takes your Curveclaw.

Step 5: Return later and collect the Curvesickle

After that event, you can come back to that room (or its vicinity) and pick up the upgraded Curvesickle lying on the ground (i.e., it will have replaced your Curveclaw).

Tips and caveats to watch out for

  • The upgrade is optional; the Arsenal achievement does not require getting Curvesickle.
  • Missing to buy the Curveclaw in Hunter’s March is not fatal — you can still recover it from Skarr’s corpse.
  • The target‐hitting challenge is somewhat precise: if one target is missed, the upgrade won’t trigger.
  • Because Curvesickle has a larger projectile and more damage, it generally becomes more useful in tougher encounters (especially in Act 3 onward).

Curveclaw and its upgrade, Curvesickle, are distinctive for their boomerang mechanic. The ability to strike multiple enemies and keep the arc active longer makes these tools superb for controlling threats both in the air and on the ground. The progression from Curveclaw to Curvesickle particularly rewards players seeking more powerful, skill-based ranged options.

Making the most of Curveclaw and Curvesickle

Mastering Curveclaw’s unique throwing arc helps dispatch boss minions and aerial threats without needing perfect aim. The Curvesickle, once unlocked, becomes a go-to option for many late-game battles and exploration sections, providing superior coverage that few other tools match

Curveclaw serves as a unique ranged answer to flying and crowded threats, while the Curvesickle elevates its strength for challenging areas, especially in Act 3. Having both ensures robust answers to some of Silksong’s trickiest fights.