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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteFarm Spirit Fighter NPCs on Blue Planet in Sea 2 to get Spirit Keys. The Sailor Piece Wiki’s captured drop table lists a 0.1765% drop rate; use the keys at the Spirit Warrior Summoner near the spaceship on Blue Planet to summon the Spirit Warrior (Goku) boss.
Where Spirit Keys drop
The documented farming route is to defeat Spirit Fighter NPCs on Blue Planet in Sea 2. They are listed on the Blue Planet Quest 24 route, and the Sailor Piece Wiki’s captured enemy drop table reports a 0.1765% Spirit Key drop rate for them. See the Sailor Piece Wiki drop table. A Beebom guide dated May 10, 2026, also identifies these NPCs as the farming source: Beebom’s Spirit Key guide.
Treat 0.1765% as a wiki-published captured rate, not an official developer guarantee. The table does not state its sample size or whether temporary luck effects change the rate, so it cannot tell you how many enemies you will need to defeat.
How to use Spirit Keys
- Go to Blue Planet in Sea 2 and follow the right-hand path toward the spaceship.
- Interact with the Spirit Warrior Summoner near the spaceship. The Sailor Piece Wiki lists this NPC and its summon requirements on its NPC Locations page.
- Select a difficulty and spend the required number of keys: Normal: 1; Medium: 2; Hard: 3; Extreme: 4.
Choose a difficulty you can clear reliably and weigh its key cost against the boss rewards you want. The available source information confirms the costs and reward context, but does not establish that a higher difficulty is the best value for every player.
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What the Spirit Warrior summon is for
Spirit Keys summon the Spirit Warrior, also referred to as the Goku boss. Boss rewards associated with this route include the Spirit Outfit and the World Protector title. The Sailor Piece Wiki’s boss guide covers the boss route and reward context.
Summoning and defeating this boss is separate from unlocking the Spirit Warrior melee style. That style uses a distinct Empyrean Trainer questline on Blue Planet; repeatedly summoning the boss is not the style’s complete unlock route.
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Is Spirit Fighter the only source?
Spirit Fighter is the documented route in the sources available here. A GAMES.GG guide dated May 10, 2026, claims there are no merchant or quest alternatives, but that exclusivity claim is not confirmed by an official developer source. For the supported farming method, focus on Spirit Fighter NPCs rather than assuming another source exists.
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