Published: March 10, 2026 
Dungeons are one of the most rewarding things you can do in Sailor Piece, but you need a Dungeon Key to get inside. These keys do not come for free, because you have to earn them by fighting world bosses. In this Sailor Piece Dungeon guide, I will show you how to get the keys and how to unlock Dungeons in the first place.
How to Get Dungeon Keys in Sailor Piece
Dungeon Keys drop from world bosses when you defeat them. Every boss has its own drop chance, and some are clearly better than others for farming keys. Here is a full breakdown of every boss and their drop rates:
| Boss | Dungeon Key Drop Chance | Location |
|---|---|---|
| Alucard | 33% | Sailor Island |
| Aizen | 30% | Hueco Mundo |
| Sukuna | 20% | Shibuya Station |
| Jinwoo | 20% | Sailor Island |
| Ichigo | 20% | Boss Island |
| Gojo | 15% | Shibuya Station |
| Qin Shi | 15% | Boss Island |
| Yuji | 12% | Shibuya Station |
| Saber | 10% | Boss Island |
If you just want to stack keys as fast as possible, Alucard and Aizen are your best options, with more than 30% drop rate. Bosses like Saber at 10% are not really worth your time if key farming is your goal. Dungeon Keys can also drop from chests, although boss farming tends to be more reliable if you want a steady supply.
How to Unlock Dungeons in Sailor Piece
Before you can even use a Dungeon Key, you need to unlock the Dungeon Spawner mechanic. You do this by completing a quest from the Dungeon Master NPC. He is available at the Dungeon Island location, so you need to teleport there first.
To start this quest, you need to be at least player level 5,000. The quest itself has two parts:
Part 1: Collect Six Ancient Dungeon Puzzle Pieces
The first task is to find six Ancient Puzzle Pieces hidden across different islands. These always spawn in the same spots for every player, so once you know where they are, it is quick to grab them all. Here is exactly where to find each one:
| Puzzle Piece | Location | Exact Spot |
|---|---|---|
| Puzzle Piece 1 | Starter Island | Leaning on the back, against the white building with the red roof |
| Puzzle Piece 2 | Jungle Island | On the rocks to the left side near the water |
| Puzzle Piece 3 | Desert Island | Go behind the island, near the rocks on the back side |
| Puzzle Piece 4 | Snow Island | Behind the igloo with a snowman, leaning against a tree trunk |
| Puzzle Piece 5 | Shibuya Station | On the rooftop to the right of the building where Sukuna spawns |
| Puzzle Piece 6 | Hueco Mundo | On top of the roof of the main dome-shaped building behind where Aizen spawns |
Part 2: Defeat 25 Bosses
Once you have all six puzzle pieces, the quest updates and asks you to defeat 25 bosses. You do not have to fight different bosses, though. The trick is that you can actually fight the same one over and over if you want. The easiest way to get this done fast is to head to Boss Island and use boss tickets to keep spawning bosses back to back. Pick a boss you can kill quickly and just grind through all 25.
After you hit 25 boss defeats, go back to the Dungeon Master NPC on Dungeon Island. Talk to him, and you will unlock the ability to spawn Dungeon portals.
Sailor Piece Dungeon Types
As of now, there are two Dungeons you can enter in Sailor Piece:
Shadow Dungeon
The Shadow Dungeon has 15 waves of enemies and is available on four difficulty modes: Easy, Medium, Hard, and Extreme. You will fight through Raiders, Commanders, Black Knights, and Knights before the whole run ends with a Shadow boss fight. This is the more combat-heavy dungeon of the two.
Rune Dungeon
The Rune Dungeon also has 15 waves and the same four difficulties. The enemy lineup is pretty similar, with Raiders, Commanders, Black Knights, and Knights, but there is no boss fight at the end. Instead, every enemy you defeat has a chance to drop Runes, making this dungeon great if you are specifically farming for those.
Greater difficulty modes give better rewards, though. So, once you are strong enough, push up to Hard or Extreme. If you are still building your character, start on Easy or Medium to get comfortable with the waves first.
So that's all about the Dungeon in Sailor Piece. When you successfully unlock them, they're definitely going to be a solid way to progress. Good luck, and don't forget to check out our Sailor Piece wiki for codes and more guides.
