Kokushibo (Moon Slayer Boss)
A summonable endgame boss on Boss Island, added in the Moon Update (March 31, 2026). Summoned at the Boss Summoner NPC using 1x Upper Seal + 700,000 Money + 700 Gems. Upper Seals drop from enemies on Shinjuku, Lawless, and Ninja Island. Drops materials needed for the Moon Slayer melee spec unlock, including the rare Moon Crest. Small buff applied on new servers (Alx, April 2, 2026: 'not a big buff as he doesn't need a big one'). Specific stat changes TBD pending full server rollout. Source: Discord #game-announcements (Alx, 2026-04-02) + Beebom/Roonby (2026-04-01).
Kokushibo (Moon Slayer Boss)
Endgame Islands
- Location
- Boss Island
- Level Required
- 12,000
- Respawn Time
- Summon only (1x Upper Seal + 700,000 Money + 700 Gems)
- HP
- 1,250,000,000
Boss Stats
| Stat | Value | Notes |
|---|---|---|
| Health | 1,250,000,000 | - |
| Level | 12,000 | - |
| Sea | Endgame Islands | - |
| Difficulty | Extreme | - |
| Respawn Time | Summon only (1x Upper Seal + 700,000 Money + 700 Gems) | - |
| Drop Count | 4 items | - |
Drop Table
Kokushibo (Moon Slayer Boss) drops 4 items. The rarest drops are Moon Crest and Crescent Shard. Farm Kokushibo (Moon Slayer Boss) consistently to accumulate materials for crafting and progression.
| Item | Type | Drop Rate | Rarity |
|---|---|---|---|
| Demon Remnant | Crafting Material | 8.91% | Rare |
| Lunar Essence | Crafting Material | 3.08% | Rare |
| Crescent Shard | Crafting Material | 0.7% | Very Rare |
| Moon Crest | Crafting Material | 0.3% | Very Rare |
Battle Strategy
Kokushibo (Moon Slayer Boss) is one of the hardest bosses in Sailor Piece. Only attempt with a fully optimized endgame build. Solo runs are extremely punishing — a coordinated group is strongly recommended. Make sure your stats, race, and accessories are all maxed before engaging.
Recommended Stats
- ‣Melee / Sword stat: 2500+ for reliable damage
- ‣Fruit stat: 2500+ if running a Devil Fruit build
- ‣Defense / HP accessories recommended for survival
Location & Respawn
Kokushibo (Moon Slayer Boss) is located at Boss Island, in the Endgame Islands zone. This is an endgame zone. You will need high-level stats and gear before travelling here.
Kokushibo (Moon Slayer Boss) respawns approximately every Summon only (1x Upper Seal + 700,000 Money + 700 Gems). If you arrive and the boss is not present, wait at the spawn location or switch to a less populated server. Many players farm this boss repeatedly for drop materials, so competition for kills can be high on busy servers.
Recommended Level: 12,000+
Players below level 12,000 will deal significantly reduced damage and may struggle to survive the encounter. Reach at least 13,200 for a comfortable fight.
Quick Reference Cards
At a Glance
Quick Overview
Kokushibo (Moon Slayer Boss)
S+ TierLevel
12000
HP
1,250,000,000
Difficulty
Extreme
Respawn
Summon only (1x Upper Seal + 700,000 Money + 700 Gems)
A summonable endgame boss on Boss Island, added in the Moon Update (March 31, 20...
Tier Position
Ranked #7 of 26 in Bosses
Kokushibo (Moon Slayer Boss) is in S+ Tier
Drop Table — Kokushibo (Moon Slayer Boss)
Drop rates are approximate and subject to game updates
Patch History
Patch History
- Moon UpdateLatest
- New boss: Kokushibo (Moon Slayer Boss) on Boss Island. Summoned with 1x Upper Seal + 700,000 Money + 700 Gems. Upper Seal drops from Shinjuku/Lawless/Ninja Island. Drops: Demon Remnant (~26%), Lunar Essence (~9%), Crescent Shard (~2%), Moon Crest (~1%). ⚠️ Alx confirmed Kokushibo will be buffed (2026-04-01 06:07 UTC) — stats may change. Source: Discord #update-logs (2026-03-31) + single-source deltias drop rates (pending verification).
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Combat Tips
- ‣Use Armament Haki to deal full damage
- ‣Bring a fruit build for maximum damage output
- ‣Team up for this boss — solo is extremely difficult
- ‣Respawns every Summon only (1x Upper Seal + 700,000 Money + 700 Gems)
Location
Last updated: 2026-04-02
Recommended Builds
Boss Synergies
Best Pairings & Synergies
Best Fruits for This Boss
Best Races for This Boss
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