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To get Spirit Keys in Sailor Piece, farm Spirit Fighter NPCs on Blue Planet in Sea 2. The Sailor Piece Wiki’s captured drop table lists a 0.1765% drop rate; it is a published wiki figure, not an official developer guarantee. Spend the keys at the Spirit Warrior Summoner on Blue Planet, near the spaceship.
Where Spirit Keys drop
Travel to Blue Planet in Sea 2 and defeat Spirit Fighter NPCs. The Sailor Piece Wiki lists Spirit Fighter on the Blue Planet Quest 24 route and reports a 0.1765% Spirit Key drop rate in its captured table. The table does not state a sample size or explain whether luck effects change the rate, so treat it as an estimate from the wiki rather than a promise of a key after a set number of defeats. A Beebom guide dated May 10, 2026, also identifies Spirit Fighters on Blue Planet as the farming route.
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Sources: Sailor Piece Wiki drop table and Beebom’s Spirit Keys guide.
How to use Spirit Keys
- Go to Blue Planet in Sea 2.
- Find the Spirit Warrior Summoner on the right-hand path by the spaceship.
- Interact with the Summoner and choose a difficulty. The key cost depends on the difficulty.
| Difficulty | Spirit Keys required |
|---|---|
| Normal | 1 |
| Medium | 2 |
| Hard | 3 |
| Extreme | 4 |
These costs and the Summoner’s location are listed in the Sailor Piece Wiki NPC Locations guide. Choose a difficulty you can clear while accounting for its key cost; available sources do not establish that the higher difficulties are the best value for every player.
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What the Spirit Key summons—and what it does not unlock
Spirit Keys summon the Spirit Warrior, also referred to as the Goku boss. The boss route is associated with rewards such as the Spirit Outfit and World Protector title; see the Sailor Piece Wiki boss guide.
Summoning this boss is separate from unlocking the Spirit Warrior melee style. That style uses a distinct Empyrean Trainer questline on Blue Planet, so repeatedly spending keys on the boss does not complete the style’s unlock route.
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Is farming Spirit Fighters the only way?
Spirit Fighters are the documented farming source in the cited guides. GAMES.GG claims the source is exclusive and that there are no merchant or quest alternatives, but that claim is not confirmed by an official developer source among the cited references. It is safer to treat Spirit Fighter farming as the established route, not to assume alternatives are definitively impossible. GAMES.GG’s guide makes the exclusivity claim.
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