If you are looking for the most powerful weapon in Sailor Piece, the Shadow Monarch Sword is your endgame goal. This mythical blade delivers the highest damage output in the entire game with lightning-fast skill animations that dominate both PvE and PvP content.
In this guide, I will walk you through every step needed to unlock this incredible weapon. The process takes time and requires completing the Jinwoo questline first, but the power boost is absolutely worth the grind.
The Shadow Monarch Sword is a mythical-tier weapon inspired by Sung Jin Woo’s gear from the Solo Leveling anime. It currently holds the title of best sword in Sailor Piece thanks to its unmatched damage numbers and rapid skill execution.
Players who focus on Weapon-stat builds benefit most from this sword. The fast animation speeds let you chain attacks together fluidly, making it devastating in PvP scenarios where every frame counts.
Before you can even think about obtaining the Shadow Monarch Sword, you need to meet several requirements. Skipping these will only waste your time.
You must reach level 5000 before you can access the content needed for this weapon. This is the minimum level for entering the Double Dungeon where the Shadow Monarch boss spawns.
Dungeons unlock progressively as you level up. Make sure you can enter and clear higher-difficulty dungeons. The better the difficulty, the better your drop rates will be.
This is the biggest hurdle. You cannot purchase the Shadow Monarch Sword without first owning the Jinwoo sword. That means completing the entire Jinwoo questline before you even start farming Shadow Monarch materials.
Keep your Jinwoo sword in your inventory at all times when you go to buy Shadow Monarch. The NPC checks for it before allowing the purchase.
The process breaks down into five main steps. Follow them in order, and you will be swinging this legendary blade before you know it.
Your journey begins on Sailor Island. Head to the right corner of the island and look for the Jinwoo Trainer NPC standing there. He is your gateway to the entire questline.
Speak with him to initiate the quest chain. You will need to complete all five quests before you can purchase the Jinwoo sword from him.
The Jinwoo questline consists of five progressively difficult challenges. Each quest tests a different aspect of your gameplay skills.
Quest 1: Take 15,000,000 Damage
You need to survive and absorb 15 million damage total. This tests your defensive capabilities and healing efficiency. Use a tanky build and find enemies that deal consistent damage without one-shotting you.
Quest 2: Kill 750 NPCs
Grind through 750 NPC kills. This is straightforward but time-consuming. Find areas with dense NPC spawns and clear them repeatedly. AoE attacks speed this up significantly.
Quest 3: Deal 75,000,000 Damage
Output 75 million damage across all your fights. Boss fights contribute heavily here, so focus on high-HP targets. Your best damage rotations will make this go faster.
Quest 4: Kill 35 Players
This PvP requirement asks you to defeat 35 other players. If PvP is not your strength, consider practicing in lower-stakes environments first. Every kill counts toward the total.
Quest 5: Kill Jinwoo Boss 15 Times
The final quest requires defeating the Jinwoo boss 15 times. You can find this boss in the boss rotation on Boss Island. Each kill brings you closer to unlocking the Jinwoo sword purchase.
After completing all five quests, return to the Jinwoo NPC on Sailor Island. You can now purchase the Jinwoo sword, but it comes with a hefty price tag.
Jinwoo Sword Cost:
Make sure you have this currency saved up before finishing the quests. Once you buy the sword, keep it in your inventory permanently. You need it to purchase the Shadow Monarch Sword later.
The Shadow Monarch NPC hides on Dungeon Island. When you arrive, make your way to the main dungeon chamber building.
Climb up to the roof of the dungeon chamber. Look in the left corner, and you will find the Shadow Monarch Trainer waiting there. Speak to him to see the purchase requirements for the ultimate sword.
This is the final step, but it requires the most farming. The Shadow Monarch Sword has both currency and material requirements.
Shadow Monarch Sword Currency Cost:
Shadow Monarch Sword Material Requirements:
These materials drop from the Shadow Monarch boss in the Double Dungeon. Higher dungeon difficulties improve your drop rates significantly, so push for the hardest content you can handle.
The material grind can take hours if you approach it wrong. Here are strategies that experienced players use to speed up the process.
Higher difficulty settings directly increase drop rates. If you can comfortably clear Hard or Nightmare modes, always choose those over Normal. The percentage boost makes a noticeable difference over dozens of runs.
The Shadow Monarch boss appears after specific waves in the Double Dungeon. You will encounter this boss at Wave 5, Wave 10, and Wave 15. Knowing when to expect the boss helps you prepare your cooldowns and resources.
To qualify for drops, you must deal at least 10% of the boss’s total HP in damage. Simply being present is not enough. Focus on dealing consistent damage throughout the fight to secure your drop chance.
Running dungeons with a coordinated team clears waves faster and makes boss fights safer. More runs per hour means more drop opportunities. Find a group through Discord or in-game chat.
Sailor Piece includes a pity system for boss drops. If you have not received a rare drop after a certain number of kills (typically around 25), the game guarantees one. This safety net prevents extremely bad luck streaks from ruining your progress.
Once you obtain the Shadow Monarch Sword, you gain access to its powerful skill set. Each attack channels shadow energy for devastating effect.
Basic Attack: Rapid sword slashes infused with dark aura.
Z Attack: Unleashes aura-imbued waves in a forward arc.
X Attack: Creates a purple dome that damages enemies within range.
C Attack: Explosive shadow burst with high damage multiplier.
V Attack: Ultimate skill with the highest damage potential and dramatic animation.
For best results, invest heavily in your Weapon stat. This directly scales all Shadow Monarch sword damage, making each hit count even more.
You need 2,500,000 Money and 7,500 Gems to purchase the Jinwoo sword after completing all five Jinwoo quests.
The Shadow Monarch boss spawns at Wave 5, Wave 10, and Wave 15 in the Double Dungeon. Prepare your strongest attacks when approaching these wave thresholds.
You need to reach level 5000 to access the Double Dungeon where the Shadow Monarch boss appears. Lower-level dungeons unlock earlier but do not contain the materials you need.
The Monarch Core drops from the Shadow Monarch boss in the Double Dungeon with a drop rate between 6.75% and 12% depending on dungeon difficulty. You must deal at least 10% of the boss HP to qualify for drops.
The Shadow Monarch NPC is located on Dungeon Island. Climb to the roof of the main dungeon chamber and look in the left corner to find the trainer.
No, you must own the Jinwoo sword and keep it in your inventory before the Shadow Monarch NPC will sell you the Shadow Monarch sword. Complete the Jinwoo questline first.
Getting the Shadow Monarch Sword in Sailor Piece requires patience, but the result is the most powerful weapon in the game. Start by completing the Jinwoo questline, purchase his sword, then farm the Shadow Monarch boss for materials. Follow this guide step by step, and you will be wielding shadow power in no time.