The Shadow Monarch is the top-tier Mythical sword in Sailor Piece, built around massive damage multipliers, short cooldowns, and wide area-of-effect attacks. Inspired by Sung Jin Woo's weaponry from Solo Leveling, it dominates both PvE boss fights and PvP encounters. Getting it requires a lengthy chain of prerequisites — starting with the Jinwoo Sword and ending with rare drops from one of the hardest dungeon bosses in the game.
Quick answer: Purchase the Shadow Monarch from the Shadow Monarch Trainer NPC on the roof of the Dungeon Island building. You must have the Jinwoo Sword in your inventory plus five rare items dropped by the Shadow Monarch boss inside the Double Dungeon.
Jinwoo Sword — The Required Prerequisite
You cannot obtain the Shadow Monarch without first owning the Jinwoo Sword. The Jinwoo Trainer NPC is located in the right corner of Sailor Island and assigns five quests that must all be completed before the sword becomes available for purchase.
Jinwoo Trainer quest requirements
| Quest | Objective |
|---|---|
| 1 | Take 15,000,000 damage |
| 2 | Kill 750 NPCs |
| 3 | Deal 75,000,000 damage |
| 4 | Kill 35 players |
| 5 | Kill the Jinwoo boss 15 times |
The Jinwoo boss spawns inside the large building on Sailor Island and alternates its spawn rotation with the Alucard boss, so expect some downtime between attempts.
Jinwoo Sword purchase cost
After finishing all five quests, return to the Jinwoo Trainer NPC. You'll need the following items and currency to buy the sword:
| Item | Quantity | Source | Drop Rate |
|---|---|---|---|
| Money | 2,500,000 | Quests and 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% |
Since the Shadow Heart only drops at a 2% rate, plan on farming the Jinwoo boss well beyond the 15 kills required by the quest chain.
Shadow Monarch Sword — Items and Where to Buy It
With the Jinwoo Sword in your inventory, travel to Dungeon Island and climb to the roof of the Dungeon building. The Shadow Monarch Trainer NPC is stationed there. Interacting with the NPC opens the purchase menu, which requires the Jinwoo Sword plus five boss-drop items.
Shadow Monarch purchase materials
Every material below drops exclusively from the Shadow Monarch boss, which spawns inside the Double Dungeon after clearing Wave 5, Wave 10, and Wave 15. Higher dungeon difficulty increases all drop rates.
| Item | Quantity Needed | Drop Rate Range |
|---|---|---|
| King of Shadows Title | 1 | 0.8% – 1.15% |
| 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% |
The King of Shadows Title and Kamish Dagger sit below 1.5% even on the highest difficulty settings, making them the primary bottleneck. Expect dozens of Shadow Monarch boss kills before collecting everything. A minimum level of 5,000 is required to access Dungeons at all, so this is strictly late-game content.
Shadow Monarch Moveset
The Shadow Monarch is classified as a Mythical Sword with high damage, low cooldowns, and broad AOE coverage. Its moveset rewards aggressive, close-to-mid-range play and chains naturally from one skill into the next.
| Key | Move | Effect |
|---|---|---|
| M1 | Basic Attack | A quick slash aimed at the enemy's midsection |
| Z | Triple Slash + Dash | Three aura-imbued slashes that send waves forward, ending with a forward dash |
| X | Giant Summon | Summons a statue-like giant that blasts enemies in its range with continuous damage |
| C | Purple Dome Flurry | Envelops the target in a purple dome and delivers rapid strikes with high critical-hit chance |
| V | Super Speed Slashes | A wide-area ultimate that deals very high damage through rapid slashes |
| F | Infinite Purple Slashes | A cinematic barrage of purple slashes plus a permanent 30% overall damage buff (requires Mastery quest) |
The F move is locked behind the Shadow Monarch Mastery questline and won't appear on the weapon until you complete it.
Shadow Monarch Mastery Quest — Unlocking the F Move
Once you own the Shadow Monarch sword, you can begin the Mastery questline by speaking to the Shadow Monarch Mastery NPC. This NPC is located on Sailor Island in the same spot as the Jinwoo Trainer NPC. Completing the questline permanently unlocks the F move and grants a 30% increase to the sword's overall damage output.
Mastery quest objectives
| Quest Name | Requirement |
|---|---|
| Dungeon Master | Clear 10 Double Dungeons on Hard or Extreme difficulty |
| Monarch's Blood | Own the Monarch Clan |
| Shadow Army | Defeat 25 Shadow Soldiers inside the Dungeon |
The Dungeon Master objective overlaps naturally with farming Shadow Monarch boss drops, so if you haven't finished collecting materials yet, you'll make progress on both goals simultaneously. Shadow Soldiers spawn at a low rate inside the Double Dungeon, but 25 kills accumulate over the course of repeated runs without much extra effort.
The hardest part of the Mastery quest is the Monarch Clan requirement. Monarch is a Legendary-tier clan, and rolling it through the clan system is extremely unlikely on any single attempt. Budget at least 100 clan rerolls — potentially more — before landing on it.
The Shadow Monarch represents the current ceiling for sword power in Sailor Piece. Between the Jinwoo Sword prerequisite, the sub-1% boss drops, and the Mastery quest's Legendary clan requirement, it demands serious time investment. But the payoff — fast attacks, massive AOE, and a 30% damage buff from the F move — makes it the definitive weapon for any end-game build.