To unlock Moon Slayer in Sailor Piece, visit the Moon Slayer Seller on Boss Island with the Six Eyed Demon title, the required currency, and five materials. The materials are associated with Kokushibo, but published drop-rate estimates disagree, so treat them as guides rather than guaranteed odds.
Moon Slayer seller requirements
The community wiki lists these requirements for the base Moon Slayer style at the seller on Boss Island:
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- Six Eyed Demon title
- 37,500 in-game currency, labeled G$ on the wiki
- 1 Moon Crest
- 4 Crescent Shards
- 9 Lunar Essences
- 16 Demon Remnants
- 25 Upper Seals
A separate guide labels the 37,500 cost as Gems rather than G$. Because third-party sources differ on the currency label, check the seller’s prompt in-game before spending time farming or gathering currency. The title is also required; the available guides do not establish its acquisition route consistently, so check the Six Eyed Demon title description in-game.
How to farm the required materials
Summon Kokushibo
Two guides identify Kokushibo as the source of Moon Crest, Crescent Shard, Lunar Essence, and Demon Remnant. They report that you can summon the boss on Boss Island with 1 Upper Seal, 700,000 Money, and 700 Gems. The guides say Upper Seals can drop from enemies on Shinjuku, Lawless, and Ninja Island. These details come from third-party guides, so confirm costs and availability in-game.
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Collect materials from repeated boss runs
Published estimates for Kokushibo’s material drops conflict. One guide estimates Demon Remnant at 8.91%, Lunar Essence at 3.08%, Crescent Shard at 0.70%, and Moon Crest at 0.30%. Another gives approximate rates of about 26%, 9%, 2%, and 1%, respectively. Neither set is established as authoritative current game data; rates may change, and the disagreement makes it unwise to plan around a specific drop chance or farming time.
Base style and F move are separate unlocks
Unlocking Moon Slayer does not automatically meet the listed requirements for its F move. The community wiki lists a separate Moon Slayer F Move Mastery NPC checklist:
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- Upper Clan
- 2 Moon Crests
- 10 Crescent Shards
- 85 Upper Seals
Upper Clan belongs to the F move requirements, not the base style seller checklist.
Is there a Shop option?
The community wiki also lists a Shop purchase for 1,399 Robux. Treat this as a reported alternative, not a guaranteed live offer or confirmation that it bypasses every unlock requirement. Check the in-game Shop for current availability and terms before purchasing. Otherwise, the seller route requires gathering the title, currency, and materials yourself; the available guides do not provide a reliable farming-time estimate.
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- Brands include Charlotte Tilbury, Sol de Janeiro, Nars, Dior, in addition to must-have brands like Rare Beauty, Glow Recipe, and Summer Fridays. You have access to over 25,000 products.
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- Please see Legal Disclaimer below for terms and conditions applicable to Sephora gift cards.
Sources and confidence
The requirements and optional Shop listing are reported by the Moon Slayer community wiki. Kokushibo’s reported summon cost and farming details come from third-party guides to Kokushibo and Moon Slayer. These are not official developer references; verify changing requirements, currency labels, and Shop availability in-game.
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