Moon Slayer is the Kokushibo-inspired fighting style added in Sailor Piece's Moon Update, and it's one of the most visually striking specs in the game. Crescent moon particles fly off every M1, the V move summons an actual moon, and the F Move drops a black domain that ends with a single devastating forward slash. Getting there takes serious farming, but the path is straightforward once you know what to prioritize.
What is Moon Slayer in Sailor Piece?
Moon Slayer is a late-game fighting style modeled after Kokushibo from Demon Slayer. Despite displaying a sword-like weapon in your hand, it's classified as a spec rather than a sword, so don't confuse it with the blade items in your inventory. The style was introduced with the Moon Update and sits among the strongest melee options currently available.
The Six-Eyed Demon Title you earn along the way isn't just a cosmetic flex. It's a hard requirement to purchase the fighting style from the NPC, which means you can't shortcut the boss grind by stockpiling gems early.
What do you need to get Moon Slayer?
Head to Boss Island and find the Moon Slayer Trainer NPC on the opposite side of the island from the spawn point, facing the water. Hand over all seven requirements and the fighting style is yours.
Here's the full list:
Drop rates above are for normal difficulty and come from Indiatimes/MSN reporting on the Moon Update. Beebom's testing showed slightly lower figures (0.30% for Moon Crest, 0.70% for Crescent Shard) on their normal-mode runs, which suggests there may be minor variance. Higher difficulty settings increase all drop rates but require more summon materials per run.
warning
The Moon Crest at 0.45% and the Six-Eyed Demon Title at 1% are your real bottlenecks. Budget most of your Upper Seals and money toward repeated boss runs before you worry about the gem count.
How to summon the Moon Slayer boss
Talk to the Boss Summoner NPC on Boss Island and scroll to the Moon Slayer Spawn option. Each normal-difficulty summon costs:
- 1x Upper Seal
- 700,000 Money
- 700 Gems
The boss carries over 1.25 billion HP on normal mode, according to Beebom's guide. You should be at level 12,000 or above before attempting it solo, per the Indiatimes walkthrough. Below that threshold you'll burn through consumables faster than the drops justify.
The Extreme difficulty version increases drop chances for the rarest items, specifically Moon Crest and the Six-Eyed Demon Title, but the boss becomes significantly harder to kill. Bringing two or three players to an Extreme run is the most efficient approach if your build can handle the coordination.
Sailor Piece Guide: How to Get Moon Slayer
How to farm Upper Seals efficiently
Upper Seals drop from any enemy in the game, but the rate improves substantially at higher-level zones. The best farming spots, according to IGN's wiki and the Lolga walkthrough, are Ninja Island, Lawless Island, and Shinjuku. Enemies here are high-level, respawn quickly, and give you better odds per kill than early-game zones.
Several things increase your effective drop rate:
- Kitsune Race passively boosts your Luck stat
- Luck Runes stack on top of racial bonuses
- Leveling up your Clan adds another Luck multiplier
- Defeating bosses and equipping titles can add further Luck buffs
- The in-game Shop sells a direct Luck stat upgrade for Robux if you want to skip the grind
- Weekend 2x Luck Events are worth timing your heavy farming sessions around
You need 25 Upper Seals just to unlock the fighting style, plus 1 per boss summon, plus 85 more for the F Move. Plan your farming accordingly.
Full Moon Slayer moveset
After testing the full kit on a melee-focused build, here's what each input does and the damage numbers attached to it:
Damage figures are from Beebom's testing on a full melee build and will vary with your stat distribution, clan buffs, and equipped titles.
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The F Move is locked by default when you first unlock Moon Slayer. You have to complete a separate unlock step at a different NPC before that 25B hit is available.
How to unlock the Moon Slayer F Move
The F Move Mastery NPC is on top of the upside-down hand statue on the right side of Boss Island. Climb to the top and interact with him. You'll need:
- Upper Clan equipped
- Moon Slayer fighting style equipped
- 2x Moon Crest
- 10x Crescent Shard
- 85x Upper Seal
The Upper Clan is obtained by rerolling your clan affiliation. According to Pro Game Guides, it grants +40% Damage, +50% Max HP, +12% Melee Damage, +12% Luck, and a 20% chance to deal 25% extra damage for 8 seconds on skill use. That last passive pairs well with Moon Slayer's heavy-hitting moves. Completing the F Move unlock also awards a permanent +30% Damage Buff for the style.
The two extra Moon Crests are the hard part. At a 0.45% drop rate on normal difficulty, expect to run the boss dozens of times before the second one shows up. This is where the Extreme difficulty summon earns its cost.
Tips to speed up the grind
- Stack Luck before every session. Equip Luck Runes, use the Kitsune Race if you have it, and make sure your clan is leveled. The difference between a 0.45% and a slightly higher adjusted rate compounds over dozens of runs.
- Bring friends to Extreme difficulty. The rarest drops have meaningfully better rates at higher difficulty. Two or three players splitting the boss's 1.25B HP makes Extreme runs viable even if your solo DPS isn't quite there.
- Auto-spawn when you're confident. The Boss Summoner NPC has an auto-spawn option. If you have a stacked build and enough summon materials, this removes the manual confirmation step between runs.
- Farm Upper Seals in bulk before starting boss runs. You'll need at least 110 total across all stages (25 for the style, roughly 30+ for boss summons, 85 for the F Move). Getting ahead of that number early means you never have to stop a farming session to go chase Seals.
Is Moon Slayer worth the grind?
For a melee build, yes. The F Move alone hits 25B damage with a +30% buff attached, and the C and V moves give you strong AoE coverage for clearing groups. The fighting style's visual design is also among the best in the game right now, which matters if you're planning to flex the Six-Eyed Demon Title you earned getting here.
The grind is genuinely long. The Moon Crest bottleneck at 0.45% means some players will clear everything else and still be waiting on that last drop. Patience and Luck stacking are the only real answers to that.
For more Roblox and Sailor Piece guides, browse the full guides library at GAMES.GG to find tips on other fighting styles, weapons, and progression systems.