The Shadow Monarch Sword is one of the strongest weapons in Sailor Piece, inspired by the iconic power of Sung Jin-Woo. If you’re aiming to dominate fights and boost your damage, this weapon is a must-have. However, unlocking it isn’t simple. You’ll need to meet specific requirements, grind materials, and know exactly where to go. Here’s a complete step-by-step guide to help you get it easily.

Step 1: Get the Sung Jinwoo Sword

Before anything else, you must have the Sung Jinwoo Sword.

This is the core requirement to unlock the Shadow Monarch Sword. Without it, the NPC won’t let you proceed, no matter how many materials you have.

So make sure you’ve already obtained this sword before moving forward.

Step 2: Collect Required Materials

Once you have the Sung Jinwoo Sword, you’ll need to gather the following items:

  • 1 Shadow Crystal
  • 2 Kamish Daggers
  • 5 Monarch Essences
  • 10 Monarch Cores
  • King of Shadows Title

How to Get These Materials

All of these materials can be obtained by completing the Double Dungeon.

You’ll need to grind this dungeon multiple times, as the drops are not guaranteed every run. Keep replaying it until you’ve collected all the required items.

Step 3: Go to Dungeon Island

After collecting all the materials, head over to Dungeon Island.

Once you arrive:

  1. Go to the spawn area
  2. Look for a white building
  3. Climb to the top of the building

This is where you’ll find the NPC you need.

Step 4: Talk to the Shadow Monarch NPC

At the top of the white building, you’ll find the Shadow Monarch NPC.

Interact with the NPC and submit all the required materials. Once everything is handed over, the NPC will reward you with the Shadow Monarch Sword.

Getting the Shadow Monarch Sword in Sailor Piece is mostly about grinding the Double Dungeon and being patient. The process might take time, but the reward is one of the best weapons in the game. If you’re serious about progressing in the game, this sword is definitely worth the effort.