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Quick answer: all six Kun Steel come from Chapter 4 onwards — five boss kills and one lava chest in the Flaming Mountains. Four weapons need two each, so you must leave one weapon uncrafted per playthrough. Collect all six before starting a New Cycle.

All 6 Kun Steel locations

#SourceHow to get it
1Hundred-Eyed Daoist Master (Ch. 4 main boss)Unmissable — drops when you finish Chapter 4 at the Webbed Hollow's Temple of Yellow Flowers
2The Duskveil (Ch. 4 secret boss)Find the Venom Daoist at Pool of Shattered Jade, then again at Court of Illumination — that opens Purple Cloud Mountain, where the Duskveil waits
3Yellow Loong (Loong Scales finale)Finish the Loong Scales questline — beat Red Loong (Ch. 1), Black Loong (Ch. 2) and Cyan Loong (Ch. 3), then fight Yellow Loong at the Relief of the Fallen Loong Shrine in the Webbed Hollow
4Lava chest (Ch. 5)From Furnace Valley's Valley Entrance Shrine, follow the path, drop to the lava level and walk to the end — a chest behind a Turtle Treasure Spirit holds it. Bring burn protection.
5Yaksha King (Ch. 5 main boss)Unmissable — drops at the end of Chapter 5 at Fallen Furnace Crater
6Erlang Shen (secret boss, Mount Mei)The hardest boss in the game — unlocked by clearing the secret areas and treasure quests across chapters. Listed under Chapter 3 but reachable only very late.

Weapons that need Kun Steel

Each costs 2 Kun Steel — six pieces, four weapons, one gets left behind per playthrough.

WeaponCostNotes
Adept Spine-Shooting Fuban Staff2Top-tier Fuban staff
Dark Iron Staff2Attack scales with your defense — ideal for tank builds
Golden Loong Staff2Loong-lineage weapon
Stormflash Loong Staff2Loong-lineage weapon
Priority tip: with only six pieces, pick the three weapons that match your build. The Dark Iron Staff's defense-scaling attack makes it a strong default for survivability builds; Loong staffs pair with the Loong questline you're already running for Kun Steel 3.

FAQ

Can you farm Kun Steel?

No — the six pieces are fixed drops: five specific bosses plus one chest. New Game Plus gives you a fresh set of six.

What's the earliest Kun Steel I can get?

Chapter 4 — the Hundred-Eyed Daoist Master (story) or the Duskveil (secret) are the first two. Yellow Loong is also in Chapter 4 but requires finishing the whole Loong Scales line.

Should I save Kun Steel for NG+?

Weapons carry into New Cycle — collect all six and craft your picks before starting NG+ so you begin with top gear.

What else does Yellow Loong drop?

Besides Kun Steel, the Sea-Supporting Tendon — needed for the strongest staff upgrades.