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In Sailor Piece, a boss’s location may mean its island, the NPC that summons it, or a game mode where it appears. Boss Island is mainly a summon and exchange hub—not the arena for every boss. This guide separates natural island spawns from summoned encounters, world bosses, Sea 2 sea beasts, raids, and mode-only bosses. Locations and availability below are reported by community guides, not independently confirmed in a live game; check in-game before making a trip because updates can change routes.
Last checked: October 8, 2026.
Natural island bosses
These community-guide entries are listed as bosses found on an island rather than as encounters that require a summon. Names in parentheses are aliases used by the guide or community.
| Boss | Location | Spawn type | Summon point or requirement | Verification note |
|---|---|---|---|---|
| Jinwoo (Solo Hunter) | Sailor Island | Natural island boss | None stated | Location reported by the boss guide. Source |
| Alucard (Vampire King) | Sailor Island | Natural island boss | None stated | Location reported by the boss guide. Source |
| Gojo (Limitless Sorcerer) | Shibuya Station | Natural island boss | None stated | Location reported by the boss guide. Source |
| Sukuna (Curse King) | Shibuya Station | Natural island boss | None stated | Location reported by the boss guide. Source |
| Aizen (Manipulator) | Hollow Island | Natural island boss | None stated | Location reported by the boss guide. Source |
| Yamato Boss | Judgement Island | Natural island boss | None stated | Location reported by the boss guide. Source |
| Strongest Shinobi | Ninja Island | Natural island boss | None stated | Location reported by the boss guide. Source |
Boss Island summons and summon routes
Boss Island is the place to find the Boss Summoner and Boss Exchange NPCs, according to a community NPC reference. That makes it a hub for initiating or managing some encounters; it does not mean the boss itself appears there. The route guide lists the following summon options, but some costs or difficulty details are incomplete or unsettled. NPC reference · Boss guide
| Boss or route | Summon point | Spawn type | Requirement | Verification note |
|---|---|---|---|---|
| Saber | Boss Island summon route | NPC-summoned | Summon cost is listed by the guide, but the underlying details are incomplete. | Confirm current cost and destination in-game. Source |
| Qin Shi | Boss Island summon route | NPC-summoned | Summon cost is listed by the guide, but the underlying details are incomplete. | Confirm current cost and destination in-game. Source |
| Ichigo | Boss Island summon route | NPC-summoned | Summon cost is listed by the guide, but the underlying details are incomplete. | Confirm current cost and destination in-game. Source |
| Gilgamesh | Boss Island summon route | NPC-summoned | Summon cost is listed by the guide, but the underlying details are incomplete. | Confirm current cost and destination in-game. Source |
| Corrupted Knight | Boss Island summon route | NPC-summoned | Summon cost is listed by the guide, but the underlying details are incomplete. | Confirm current cost and destination in-game. Source |
| Moon Slayer | Boss Island summon route | NPC-summoned | Summon cost is listed by the guide, but the underlying details are incomplete. | Confirm current cost and destination in-game. Source |
| Ice Queen | Boss Island summon route | NPC-summoned | Summon cost is listed by the guide, but the underlying details are incomplete. | Confirm current cost and destination in-game. Source |
| Black Reaper Boss | Isolation Island | Summoned | Summon route is listed; specific requirements are not established here. | Confirm current availability and requirements in-game. Source |
| Dante Boss | Dante Island, Sea 2 | Manually summoned | Requires Demonic Shards; the guide says the summon teleports players into the castle. | Reported route; verify the current shard requirement in-game. Source |
| Spirit Warrior (Goku) | Blue Planet / Goku island | Summoned | Summoner is described as being on the right path by the spaceship. | NPC location comes from a community NPC reference. Source |
Bosses tied to modes, raids, and the open sea
| Boss or encounter | Location or mode | Spawn type | Summon point or requirement | Verification note |
|---|---|---|---|---|
| Madoka | Boss Rush or Infinite Tower | Random mode boss | Enter the relevant mode; no separate summon requirement is stated. | The guide says there is no current unique title capture. Source |
| Dragon Slayer (Ragna) | Boss Rush or Infinite Tower | Random mode boss | Enter the relevant mode; no separate summon requirement is stated. | Mode route reported by the boss guide. Source |
| Cosmic Being | Punch Island | World boss | Spawn interval is not included because community pages conflict. | Check in-game rather than relying on a timing claim. Source |
| Sea Serpent | Sea 2 open sea | Sea beast | Spawn is described as bounty-dependent. | Exact trigger details are not established here. Source |
| Kraken | Sea 2 open sea | Sea beast | Spawn is described as bounty-dependent. | Exact trigger details are not established here. Source |
| Minotaur Raid | Blue Planet / Blue Island raid hub | Raid encounter | Use the raid hub; entry details are not specified here. | Raid location reported by the NPC reference. Source |
| Broly Raid | Broly Island | Raid encounter | Entry details are not specified here. | The guide reported a bug on July 20, 2026, and said the displayed reward was unverified. Check its current status and reward in-game. Source |
Unknown or legacy boss locations
Toji Boss
The community boss guide does not provide Toji’s location or summon method. Neither should be inferred from another boss’s route. Source
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The same guide marks Great Mage as removed and not currently spawnable, so treat it as a legacy entry rather than a current destination. Source
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why boss counts differ
Community pages report totals of 23, 27, and 35 bosses. Those figures do not establish an official roster count: pages may reflect different update dates or inclusion rules, and the fullest list includes unknown, removed, and unverified entries. Use the route tables above as a navigational reference, not a guarantee that every listed encounter is currently available. Boss guide · NPC reference
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How to use these locations when planning a run
- For Sailor Island, Shibuya Station, Hollow Island, Judgement Island, or Ninja Island, travel to the listed island for the natural boss route.
- For summon encounters, identify the summoning NPC or route first; Boss Island is a summon hub, while some summon mechanics send players elsewhere.
- For Sea 2 sea beasts and mode or raid bosses, use the relevant open-sea area, game mode, or raid hub rather than searching the ordinary island roster.
- Before farming, confirm current entry costs, spawn status, and any event or bug notices in-game. Community pages can lag behind updates, and this guide does not establish drop rates.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
