Moon Slayer is one of the flashiest and most powerful late-game fighting styles added to Sailor Piece in the Moon Update, inspired by Kokushibo from Demon Slayer. Unlocking it requires a trip to Boss Island, a serious grind against one of the toughest bosses in the game, and a specific set of rare materials. Here is everything you need to know to get Moon Slayer and unlock its F Move.
Where to Get Moon Slayer in Sailor Piece
You can obtain the Moon Slayer fighting style by speaking to the Moon Slayer Trainer NPC on Boss Island. From the spawn point, head straight across to the opposite side of the island, facing the water, and you will find the NPC waiting there. Interact with them to see the full list of required materials.
All Materials Required to Unlock Moon Slayer
Before you start farming, here is a complete breakdown of every item you need to submit to the Moon Slayer Trainer NPC:
| Item | Quantity | How to Get |
| Six-Eyed Demon Title | 1 | Drops from defeating the Moon Slayer Boss |
| Gems | 37,500 | Quests, Chest drops, Boss farming |
| Moon Crest | 1 | 0.30% drop from Moon Slayer Boss (Normal) |
| Crescent Shard | 4 | 0.70% drop from Moon Slayer Boss (Normal) |
| Lunar Essence | 9 | 3.08% drop from Moon Slayer Boss (Normal) |
| Demon Remnant | 16 | 8.91% drop from Moon Slayer Boss (Normal) |
| Upper Seal | 25 | Drops from any enemy, mini-boss, or world boss |
Note: Drop rates listed above apply to Normal difficulty. Higher difficulty modes increase drop chances for all items but also require more summoning materials.
How to Summon the Moon Slayer Boss
The Moon Slayer Boss is also located on Boss Island. Head to the Boss Summoner NPC, scroll down to the bottom of the Summon menu, and select the Moon Slayer spawn option.
To summon the Moon Slayer Boss on Normal difficulty, you will need:
- 1 Upper Seal
- 700,000 Money
- 700 Gems
The Moon Slayer Boss has over 1.25 billion HP in Normal mode, making it one of the strongest bosses in the game. Because of that, you will want to bring powerful Devil Fruit abilities, top-tier fighting styles, and the best swords available to you before attempting this fight. Improving your skill tree, unlocking better races and clans, and equipping high-damage titles will also noticeably increase your output.
Upon defeating the Moon Slayer Boss, it has a chance to drop the following items:
- Money
- Gems
- XP
- Demon Remnant
- Lunar Essence
- Moon Outfit
- Crescent Shard
- Moon Crest
- Six-Eyed Demon Title
How to Farm Upper Seals Efficiently
Upper Seals are a Legendary drop that you will need in large quantities throughout this entire process, both for summoning the boss and for unlocking the F Move later. Here is how to farm them efficiently:
- Defeat standard enemies on Ninja Island and Lawless Island, as both locations offer solid Upper Seal drop rates from regular mobs
- Farm world bosses and mini-bosses, which have higher drop chances than standard enemies
- Increase your Luck stat to improve drop rates across the board. You can do this by:
- Equipping the Kitsune Race
- Using Runes that boost Luck
- Levelling up your Clan
- Equipping titles earned from boss defeats
- Purchasing a Luck stat upgrade from the Shop using Robux
How to Unlock the Moon Slayer F Move
Once you have the Moon Slayer fighting style, the F Move is locked by default and requires a separate set of materials to unlock. The F Move grants a +30% Damage Buff for Moon Slayer, so it is absolutely worth going after.
To find the unlock NPC, climb to the top of the hand statue on the white side of the Boss Arena at Boss Island. On the right side of the structure, you will find the Moon Slayer F Move Mastery NPC. Submit the following items to unlock the ability:
| Item | Quantity |
| Upper Clan | Equipped |
| Moon Slayer | Already unlocked |
| Moon Crest | 2 |
| Crescent Shard | 10 |
| Upper Seal | 85 |
To get the Upper Clan, you will need to reroll your clan in Sailor Piece. The Upper Clan provides significant buffs: +40% Damage, +50% Max HP, +12% Melee Damage, +12% Luck, and a +20% chance to deal 25% extra damage for 8 seconds when using a skill.
Moon Slayer Full Moveset
Here is a complete breakdown of every Moon Slayer move and its damage output, tested on a full melee build:
| Keybind | Move Description | Damage |
| M1 | Powerful slashes that emit crescent moon particles | 300M (Normal) / 900M (Crit) |
| Z | Forward slash followed by a powerful somersault attack | 2.3 Billion |
| X | Two slashes into a continuous forward slashing technique | 3.5 Billion |
| C | Lifts the enemy and fills the area with purple craters | 6 Billion |
| V | Cutscene move summoning the moon, unleashing a ground cut that demolishes mobs | 14.5 Billion |
| F | Creates a black domain with continuous slashes, ending with a single powerful forward strike | 25 Billion |
Note: Damage numbers above reflect a full melee build. Your results may vary depending on your current setup, stats, and equipped gear.
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