The Jinwoo sword is a powerful weapon in Sailor Piece inspired by Sung Jin Woo from Solo Leveling. It sits at the core of the game's strongest upgrade path — you need it in your inventory before you can eventually purchase the Shadow Monarch sword, which is widely considered the best weapon in the game. Getting the Jinwoo sword requires finishing a five-part quest chain, farming a boss for rare materials, and spending a hefty amount of Money and Gems.
Quick answer: Talk to the Jinwoo Trainer NPC in the right corner of Sailor Island, complete all five quests he assigns, then purchase the Jinwoo sword from him for 2,500,000 Money, 7,500 Gems, 6 Abyss Edge, 3 Dark Ring, and 1 Shadow Heart.
Jinwoo Trainer NPC Location
The Jinwoo Trainer NPC stands in the right corner of Sailor Island. Walk up to him and interact to receive the quest chain. He won't sell you the sword until every quest is marked complete, so treat the conversation as the starting gun for a lengthy grind.
Five Quests You Must Complete
The Jinwoo Trainer assigns five tasks that must all be finished before the purchase option unlocks. These quests can be worked on simultaneously, though the player-kill requirement and boss-kill requirement tend to take the longest.
| Quest | Requirement |
|---|---|
| Take damage | Absorb 15,000,000 (15M) total damage |
| Kill NPCs | Defeat 750 NPCs |
| Deal damage | Inflict 75,000,000 (75M) total damage |
| Kill players | Eliminate 35 players |
| Kill Jinwoo boss | Defeat the Jinwoo boss 15 times |
The damage and NPC-kill tasks will fill up naturally as you grind levels and farm the Jinwoo boss. The player-kill quest is the most frustrating for PvE-focused players — you need 35 unique or repeated kills in PvP. If you're struggling, try joining less populated servers where opponents are easier to find and engage.
Jinwoo Boss Location and Spawn Pattern
The Jinwoo boss spawns inside the large building on Sailor Island. He alternates spawns with the Alucard boss, so you may need to wait through an Alucard cycle before Jinwoo appears again. Each cycle can take a while, which is why many players consider this grind time-intensive. Killing the boss 15 times for the quest — and farming enough material drops — means you'll be running this fight repeatedly.
Materials Needed to Buy the Jinwoo Sword
Once all five quests are done, return to the Jinwoo Trainer. He sells the sword in exchange for currency and boss-drop materials. Every material besides Money and Gems comes from the Jinwoo boss.
| Material | Amount | Source | Drop Rate |
|---|---|---|---|
| Money | 2,500,000 | Quests, chests | N/A |
| Gems | 7,500 | Chests | N/A |
| Abyss Edge | 6 | Jinwoo boss | 17.5% |
| Dark Ring | 3 | Jinwoo boss | 7% |
| Shadow Heart | 1 | Jinwoo boss | 2% |
The Shadow Heart is the rarest drop at just a 2% chance. Statistically, you may need around 50 boss kills to see one, though luck varies wildly. The Abyss Edge drops frequently enough that you'll likely have extras by the time you finish the quest chain. Dark Rings sit in the middle at 7%, so expect to need roughly 40–45 kills to collect three.
Tips for Farming the Jinwoo Boss Efficiently
Pair a strong sword with Runes and Accessories to speed up each kill. If you're still in the mid-game, an Epic or Legendary sword like Escanor or Yamato will help you deal enough damage to solo the boss comfortably. Grouping up with other players also shortens each fight, though drops are individual.
Between boss spawns, use the downtime to work on the NPC-kill and damage quests elsewhere on the map. This keeps your overall progress moving even when the Jinwoo boss hasn't respawned yet.
Upgrading to Shadow Monarch
The Jinwoo sword is not the end of the line — it's actually a prerequisite for the Shadow Monarch sword, the strongest weapon in Sailor Piece. The Shadow Monarch Trainer NPC is located on the roof of the building on Dungeon Island. You must have the Jinwoo sword in your inventory when you interact with him. Importantly, the Jinwoo sword is not consumed during the purchase; it stays in your inventory.
The Shadow Monarch sword requires a separate set of materials dropped by the Shadow Monarch boss, which spawns in the Dungeon after clearing Wave 5, Wave 10, or Wave 15. You need to be at least level 5,000 to access Dungeons. Higher Dungeon difficulty increases drop rates for the required items.
| Material | Amount | Drop Rate Range |
|---|---|---|
| Monarch Core | 10 | 6.75% – 12% |
| Monarch Essence | 5 | 2.75% – 6.5% |
| Kamish Dagger | 2 | 0.75% – 1.4% |
| Shadow Crystal | 1 | 0.5% – 1% |
| King of Shadows Title | 1 | 0.8% – 1.15% |
The Kamish Dagger, Shadow Crystal, and King of Shadows Title all have drop rates below 1.5%, making the Shadow Monarch grind significantly longer than the Jinwoo sword grind. Running Dungeons on the highest difficulty you can handle is the best way to improve your odds.
Shadow Monarch Sword Skills
Once you have the Shadow Monarch sword equipped, you gain access to a full moveset built around fast, high-damage strikes that chain together well in both PvP and PvE.
| Input | Skill |
|---|---|
| Left click | A basic slash aimed at the enemy's midsection |
| Z | Three consecutive slashes that send aura waves forward, ending with a dash |
| X | Summons a giant that blasts all enemies in range |
| C | Traps the enemy in a purple dome and delivers a flurry of strikes with high critical-hit chance |
| V | An ultimate attack that deals massive damage |
The C skill's critical-hit potential makes it especially devastating against bosses with large health pools, while the Z skill's forward dash gives you mobility during fights.
The Jinwoo sword is one of the most rewarding grinds in Sailor Piece, both as a standalone weapon and as the gateway to the Shadow Monarch. Budget your time around the boss spawn rotation on Sailor Island, knock out the player-kill quest early so it doesn't bottleneck you later, and keep an eye on your Shadow Heart count — that 2% drop is the real wall between you and the sword.