Community wiki pages report that you obtain the Shadow Monarch sword from the Shadow Monarch NPC on Dungeon Island after acquiring a base sword, the King of Shadows title, and four materials. The reported materials drop from the Shadow Monarch Boss in Double Dungeon. The base sword’s name is disputed: one source says Solo Hunter, while other guides say Jinwoo. These requirements come from fan-maintained pages, not surfaced official game documentation, so check the live NPC requirements before farming.
Where to get the Shadow Monarch sword
The Sailor Piece Wiki lists Shadow Monarch as an upgrade sword sold by the Shadow Monarch NPC on Dungeon Island. Its location instructions say to climb to the roof of the dungeon structure. Community guides place the Shadow Monarch Boss in Double Dungeon on Dungeon Island, making that the reported destination for farming the required materials. Sailor Piece Wiki: Shadow Monarch Sailor Piece Wiki: Double Dungeon
Reported requirements and materials
The wiki’s listed purchase requirements are:
- One base sword: listed as Solo Hunter by the Sailor Piece Wiki.
- The King of Shadows title.
- 10 Monarch Core.
- 5 Monarch Essence.
- 2 Kamish Dagger.
- 1 Shadow Crystal.
The same wiki attributes all four materials to drops from the Shadow Monarch Boss in Double Dungeon. It does not establish drop rates in the cited acquisition entry, so plan for repeated runs rather than relying on an assumed number of clears. Sailor Piece Wiki: Shadow Monarch
Check the base-sword name before you farm
There is a meaningful naming conflict in the community guides. The wiki lists Solo Hunter, while separate guides describe obtaining a Jinwoo sword from the Jinwoo Trainer on Sailor Island and then upgrading it at the Dungeon Island rooftop trainer. The sources do not clarify whether Jinwoo and Solo Hunter are alternate names, a rename, or an error. Before collecting the boss drops, inspect the Shadow Monarch NPC’s current requirement in your game and use the name it displays. Sailor Piece Wiki: Shadow Monarch Sailor Piece guide: Shadow Monarch Sword Sportskeeda: Sailor Piece Shadow Monarch Sword
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How to farm and buy it
- Confirm the base sword and title. Check the Shadow Monarch NPC to see whether the live game asks for Solo Hunter or Jinwoo, and verify that you have the King of Shadows title.
- Go to Double Dungeon. Community pages identify the Shadow Monarch Boss there as the source of Monarch Core, Monarch Essence, Kamish Dagger, and Shadow Crystal.
- Farm until you have the listed quantities. The reported target is 10 Monarch Core, 5 Monarch Essence, 2 Kamish Dagger, and 1 Shadow Crystal. No dependable drop-rate figure is established by the sources used here.
- Return to Dungeon Island’s dungeon rooftop. Speak to the Shadow Monarch NPC and purchase the sword if the live-game requirements match.
Shadow Monarch mastery requirements and reward
The Sailor Piece Wiki lists three mastery objectives: clear Double Dungeon 10 times on Hard or Extreme difficulty, own the Monarch clan, and defeat 25 Shadow Soldiers in the dungeon. It says completing them unlocks the sword’s F move and grants +30% permanent damage on the sword. A Fandom entry reports the same objectives and says the F move is initially locked. Treat the tasks and reward as community-reported details, not official patch documentation. Sailor Piece Wiki: Shadow Monarch Sailor Piece Wiki: Swords
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is confirmed—and what may change
The acquisition route and mastery details available in community pages are useful as a checklist, but no official game documentation confirming them surfaced. Fan-maintained requirements can become outdated after an update. If the NPC’s current dialogue or purchase panel differs—especially on the base-sword name, title, or material count—follow the live game rather than an older guide.
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