Very Hard5000+4 Players Max

Rune Dungeon

The primary dungeon in Sailor Piece, accessed via Dungeon Island after completing the Dungeon Master quest chain. Features 15 waves of enemies with a 5-minute timer per wave — players can die unlimited times and respawn before the timer ends. The Rune Dungeon is the only way to obtain Runes — powerful end-game modifiers that provide large damage, defense, luck, and special effect bonuses. Runes have levels that increase by completing more dungeon runs. Selectable difficulty: Easy, Medium, Hard, Extreme — harder difficulties yield higher rune drop rates and more XP/money.

Overview

Level Required

5000+

Difficulty

Very Hard

Max Players

Estimated Time

10-20 minutes depending on build strength

Sea Region

Endgame Islands

Last Updated

2026-03-15

Boss

S+
Shadow / Shadow Monarch
Final boss of Rune Dungeon

Rewards

•
Havoc Rune
rare
•
Wrath Rune
rare
•
Fortune Rune
rare
•
Inferno Rune
rare
•
Blood Rune
rare
•
Guardian Rune
rare
•
Destruction Rune
rare
•
Frost Rune
rare
•
Suppression Rune
rare
•
Dungeon Key
uncommon

Requirements

1
Minimum level: 5000
2
Complete the Dungeon Master NPC quest chain on Dungeon Island
3
Collect all 6 Ancient Puzzle Pieces from islands across the map
4
Defeat 25 bosses (open-world and mini-bosses both count)
5
A Dungeon Key or Rush Key (depending on the dungeon type)

Strategy Guide

The Rune Dungeon runs 15 waves with a 5-minute timer per wave. You can die and respawn unlimited times before each wave timer expires — do not panic when you die; just respawn and keep attacking.

Difficulty Modifiers

•
Easy / Medium
Good for learning wave patterns and reaching rune level milestones faster.
•
Hard / Extreme
Higher rune drop rates and more XP/money. Only attempt Extreme once your sword is S-tier and your Haki is fully trained.

Tips

• Each rune levels up by collecting duplicate copies (502 duplicates to reach Lv50). You can only equip one rune at a time. Prioritize leveling Havoc Rune first — it has the highest flat damage bonus in the game per level, confirmed by the official Discord FAQ.
• Team tip: Group runs (up to 4 players) are strongly recommended for Extreme difficulty. Coordinate so one player draws enemy attention while others deal damage from range.

Recommended Builds

Builds that perform well in Rune Dungeon:

•
Warlord + Strongest Shinobi (Current Best Combat Build)
•
Kitsune + Eminence Clan Farming Build (Massive Update Meta)
•
Galevorn + Anos Pure Melee Endgame