The Shadow Monarch himself, Jinwoo Boss, is one of the most challenging and rewarding World Bosses in Sailor Piece. Located in the Shadow Dungeon, this boss requires teamwork, strategy, and proper preparation to defeat. The rewards are worth it though—Jinwoo drops materials for the legendary Shadow Monarch weapon and valuable race rerolls.

Sailor Piece Jinwoo Boss spawns every 30 minutes and requires a team of 2-4 players to defeat efficiently. This guide covers everything you need to know about finding and defeating the Jinwoo Boss.

Jinwoo Boss Overview

  • Boss Level: 5000+
  • Spawn Time: Every 30 minutes
  • Location: Shadow Dungeon
  • HP Pool: Very High (raid boss)
  • Difficulty: Hard (requires team)

Jinwoo Boss Location

How to Find Jinwoo Boss

  1. Go to Shadow Dungeon (late-game area)
  2. Wait for spawn announcement (or check every 30 min)
  3. Look for the boss arena in the center of the dungeon
  4. Join or create a team of 2-4 players

Jinwoo Boss Drops

  • Monarch Core: For crafting Shadow Monarch weapon
  • Shadow Fragment: For shadow-related unlocks
  • Race Reroll: Guaranteed drop
  • Jinwoo Sword: Rare drop (for shadow builds)

Fight Strategy

Phase 1 (100% - 70% HP)

  • Abilities: Shadow army summons, dark slashes
  • Strategy: Spread out to avoid AOE
  • Damage: Medium

Phase 2 (70% - 30% HP)

  • Abilities: Domain expansion, more summons
  • Strategy: Focus adds, watch for domain AOE
  • Damage: High

Phase 3 (30% - 0% HP)

  • Abilities: Enraged state, maximum damage
  • Strategy: All out damage, use potions
  • Damage: Very High

Best Builds for Jinwoo Boss

Frequently Asked Questions

How many people for Jinwoo Boss?

Jinwoo Boss can technically be soloed by max-level players, but requires 2-4 players for efficient farming.

What is the best time to fight Jinwoo Boss?

Fight Jinwoo Boss when you have Armament Haki maxed and a legendary weapon. Most players attempt around level 2000+.

Does Jinwoo Boss drop Shadow Monarch?

Jinwoo Boss drops Monarch Core, which is required to craft Shadow Monarch weapon.