Bosses are the farming backbone of Sailor Piece. They drop weapons, titles, materials, accessories, summon keys, quest pieces, and late-game unlocks, so the best boss to fight is usually the one that matches the route you are building toward.
Group
Items
Bosses cover open-world spawns, summon fights, Sea Beasts, dungeons, and event encounters. Their drops support weapon, title, accessory, and late-game progression.
Jinwoo
One of the first bosses players will encounter on Sailor Island. Jinwoo has 6M HP and drops Abyss Edge, Dark Ring, and Shadow Heart materials used for sword progression.
- Tier
- -
- Type
- -
- boss stage
- Early Islands
- difficulty
- Easy
- level
- 0
- HP
- 6,000,000
- encounter type
- Boss fight
- access / respawn
- ~6.5 minutes
Alucard
A mid-tier open-world boss on Sailor Island with 20M HP. Alucard drops the Soul Amulet accessory, the Casull weapon, and the Blood Ring.
- Tier
- -
- Type
- -
- boss stage
- Early Islands
- difficulty
- Medium
- level
- 0
- HP
- 20,000,000
- encounter type
- World boss
- access / respawn
- ~5 minutes
Yuji
An early-game open-world boss at Shibuya Station with 3.75M HP. Yuji drops Energy Core (25%), Flash Impact (9%), and Divergent Pulse (4%), key crafting materials for early progression.
- Tier
- -
- Type
- -
- boss stage
- Early Islands
- difficulty
- Easy
- level
- 3,000
- HP
- 3,750,000
- encounter type
- World boss
- access / respawn
- ~5 minutes
Gojo
An early-to-mid boss at Shibuya Station with 4M HP. Gojo drops the Limitless Key (30%) needed to summon Strongest of Today, plus Void Fragment and Limitless Ring.
- Tier
- -
- Type
- -
- boss stage
- Early Islands
- difficulty
- Easy
- level
- 3,000
- HP
- 4,000,000
- encounter type
- Summon boss
- access / respawn
- ~5 minutes
Sukuna
The strongest of the Shibuya Station trio with 5M HP. Sukuna drops the Malevolent Key (30%) needed to summon Strongest in History, plus Cursed Finger and Dismantle Fang.
- Tier
- -
- Type
- -
- boss stage
- Early Islands
- difficulty
- Medium
- level
- 3,000
- HP
- 5,000,000
- encounter type
- Summon boss
- access / respawn
- ~5 minutes
Escanor
The Boss Rush exclusive boss, encountered during the Boss Rush gamemode (15 waves / 300s time limit / 1 Rush Key per entry / ≥10% HP required to receive loot) on Sailor Island. Escanor's HP scales with Boss Rush difficulty. Drops the Escanor weapon (5.74% chance, no pity), Sun Armor (0.5-1.5%), and The One title (0.85-1.75%). sailorpiecewiki /entries/boss-rush (2026-04-23) lists per-difficulty drop rates: Easy 0.6% / Medium 0.85% / Hard 1.25% / Extreme 1.85%. Boss Rush difficulties: Easy (DR 35% less effective), Medium (DR 70% less, lifesteal 50% less), Hard/Extreme (DR disabled, lifesteal disabled, iFrames 1.5s only). Boss Rush Shop max permanent upgrade cost: 6,625 Rush Coins.
- Tier
- -
- Type
- -
- boss stage
- Early Islands
- difficulty
- Extreme
- level
- 0
- HP
- 100,000,000
- encounter type
- Boss Rush
- access / respawn
- Boss Rush only (requires Rush Key)
Aizen
A powerful mid-to-late boss at Hueco Mundo with 25M HP. Aizen drops the Mirage Pendant accessory (20%), Illusion Prism (8%), Reiatsu Core (3%), and the rare Hogyoku Fragment (1.2%).
- Tier
- S+
- Type
- -
- boss stage
- Mid Islands
- difficulty
- Hard
- level
- 5,000
- HP
- 25,000,000
- encounter type
- Boss fight
- access / respawn
- ~5 minutes
Saber
A summonable boss on Boss Island requiring 1 Boss Key + 100K Cash + 175 Gems. Saber is one of the more accessible summonable bosses with a 2% chance to drop the Saber sword.
- Tier
- -
- Type
- -
- boss stage
- Mid Islands
- difficulty
- Medium
- level
- 1,500
- HP
- 2,500,000
- encounter type
- Summon boss
- access / respawn
- Summon only
Qin Shi
A summonable boss on Boss Island requiring 3 Boss Keys + 250K Cash + 400 Gems. Qin Shi drops Jade Tablet (6%) and Imperial Seal (2%).
- Tier
- -
- Type
- -
- boss stage
- Mid Islands
- difficulty
- Hard
- level
- 0
- HP
- 10,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only
Ichigo
A 65M HP summonable boss on Boss Island, requiring 5 Boss Keys + 350K Cash + 600 Gems. Ichigo drops Soul Fragment (6%), Spiritual Core (1.75%), and the rare Soul Flame (0.7%).
- Tier
- -
- Type
- -
- boss stage
- Mid Islands
- difficulty
- Hard
- level
- 1,500
- HP
- 65,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only
Shadow
The dungeon boss encountered in the Cid Dungeon (Waves 5/10/15). Shadow's HP scales from 20M to 500M based on difficulty. Drops Umbral Capsule and Void Seed.
- Tier
- -
- Type
- -
- boss stage
- Mid Islands
- difficulty
- Hard
- level
- 5,000
- HP
- 20,000,000
- encounter type
- Dungeon boss
- access / respawn
- Dungeon only
Ragna
An event boss on Christmas Island with 12.5M HP and 5-minute cooldown. Drops Wyrm Band (25%), Black Frost (9%), and Silver Requiem (3.5%).
- Tier
- -
- Type
- -
- boss stage
- Mid Islands
- difficulty
- Medium
- level
- 0
- HP
- 12,500,000
- encounter type
- Boss fight
- access / respawn
- ~5 minutes (event cooldown)
Cosmic Being
A Sea 2 world boss inspired by Cosmic Garou from One Punch Man. It spawns every 30 minutes at Punch Island after the previous instance is defeated. The fight has no pity system, and drops the Cosmic Being melee spec and damage title (+95%). It has 40% NPC damage reduction. Every 25% HP, one of four effects triggers: Harden (+10% DR), Rage (+25% player damage), Accelerate (+25% movement speed), or Regenerate (+10% HP), with up to three triggers per fight.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Extreme
- level
- 14,500
- HP
- 500,000,000,000
- encounter type
- World boss
- access / respawn
- 30 minutes after defeat (server time)
The World
The World is a Sea 2 summon on Bizarre Island with four difficulty modes. It has 5,000,000,000 HP and uses one to four Dominion Brands for the summon. It drops the Time Tyrant title and materials for The World fighting style.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Very Hard
- level
- 13,500
- HP
- 5,000,000,000
- encounter type
- Summon boss
- access / respawn
- Summon-based (1 Dominion Brand per Normal summon)
Great Mage
Great Mage was an Easter Event boss, but it can no longer be spawned or defeated. Its old rewards are unavailable now or trade-only.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Very Hard
- level
- 13,000
- HP
- 3,500,000,000 (legacy)
- encounter type
- Summon boss
- access / respawn
- No longer spawns.
Kraken
Kraken is a Sea 2 sea beast with about 1.25T HP. It shares a drop pool with Sea Serpent and has higher HP and higher drop chances.
- Tier
- -
- Type
- Beast
- boss stage
- Endgame Islands
- difficulty
- Very Hard
- level
- 13,000
- HP
- 1,250,000,000,000
- encounter type
- Sea creature
- access / respawn
- Bounty-dependent (500k+ bounty required, server cap 1 Kraken)
Sea Serpent
Sea Serpent is a Sea 2 sea beast with about 625B HP. It shares its drop pool with Kraken, which has higher HP and drop chances.
- Tier
- -
- Type
- Beast
- boss stage
- Endgame Islands
- difficulty
- Very Hard
- level
- 13,000
- HP
- 625,000,000,000
- encounter type
- Sea creature
- access / respawn
- Bounty-dependent (500k+ bounty required, server cap 1 Sea Serpent)
Madoka
The hardest open-world boss with 250M HP, located on Valentine Island. Madoka guarantees a Heart drop (100%) and also drops Divine Fragment (6%) and Sacred Bow (4%). Requires a coordinated group.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Extreme
- level
- 0
- HP
- 250,000,000
- encounter type
- World boss
- access / respawn
- ~6.5 minutes
Gilgamesh
A 300M+ HP endgame summonable boss on Boss Island, requiring 1 Divine Grail + 500K Cash + 500 Gems. Drops Throne Remnant (11.5%), Ancient Shard (4.5%), Golden Essence (1.5%), and Phantasm Core (0.5%).
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Very Hard
- level
- 0
- HP
- 300,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only
Strongest of Today
A powerful summonable boss on Shinjuku Island (125M+ HP), summoned with a Limitless Key from Gojo. Drops Reversal Pulse (15%), Six Eye (6%), Blue Singularity (2%), and Infinity Essence (0.65%).
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Very Hard
- level
- 6,250
- HP
- 125,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only
Strongest in History
The hardest summonable boss on Shinjuku Island (150M+ HP), summoned with a Malevolent Key from Sukuna. Drops Awakened Cursed Finger (15%), Vessel Ring (6%), Malevolent Soul (2%), and Cursed Flesh (0.65%).
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Extreme
- level
- 6,250
- HP
- 150,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only
Rimuru
A summonable slime boss on Slime Island (200M+ HP), requiring 1 Slime Key. Drops Sage Pulse (13.5%) and Tempest Seal (5.5%).
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Very Hard
- level
- 8,000
- HP
- 200,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only
Anos
A 350M+ HP endgame summonable boss on Academy Island, requiring 1 Calamity Seal. Anos drops Demonic Fragment (11.5%) and Demonic Shard (4.5%).
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Extreme
- level
- 9,000
- HP
- 350,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only
Shadow Monarch
The ultimate dungeon boss in the Double Dungeon with 750M HP. Drops Monarch Core (6.75%), Monarch Essence (2.75%), Shadow Crystal, and the rare Kamish Dagger weapon.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Extreme
- level
- 5,000
- HP
- 750,000,000
- encounter type
- Dungeon boss
- access / respawn
- Dungeon only
True Aizen
The strongest summonable boss on Soul Society with 850M HP (Normal difficulty). Summoned via Chrysalis Sigils farmed from Quincy NPCs on Soul Society. Drops the Transcendent Being title (+72.5% DMG), the best damage title in the game, along with Evolution Fragment, Transcendent Core, Divinity Essence, Fusion Ring, and the Manipulator Outfit accessory.
- Tier
- S+
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Extreme
- level
- 5,000
- HP
- 850,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only
Yamato
A powerful summonable boss on Judgement Island with 850M HP (Normal difficulty). Drops materials for the Yamato sword, including Azure Heart (0.5%), Yamato Essence (2.5%), Frozen Will (4.25%), and Silent Storm, plus the Blade Sovereign title (1%) and Imperial Outfit accessory.
- Tier
- S+
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Extreme
- level
- 5,000
- HP
- 850,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only
Blessed Maiden
A summonable boss on Boss Island with 650M HP (Normal difficulty). Summoned via Tempest Relics + Cash + Gems at the Boss Summoner NPC. Normal: 1 Tempest Relic + 600K Cash + 600 Gems. Drops the Astral Empress title (+70% DMG), Aero Core, Gale Essence, and the Maiden Outfit accessory.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Extreme
- level
- 0
- HP
- 650,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only
Saber Alter
A powerful boss added in the Alter Update (March 16, 2026). Summoned on Boss Island using Dark Grails + Money + Gems. Three difficulty levels: Normal (1 Grail), Hard (2 Grails), Extreme (4 Grails). Must deal at least 10% of boss HP to receive rewards. Drops Corrupt Crown and Corruption materials for Saber Alter weapon crafting.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Hard
- level
- 0
- HP
- 750,000,000
- encounter type
- Summon boss
- access / respawn
- Summoned at Boss Island with Dark Grails and currency.
Moon Slayer
Kokushibo is the Boss Island summon for Moon Slayer progression. It requires 1 Upper Seal, 700,000 Money, and 700 Gems. The boss drops Moon Crest, Demon Remnant, Lunar Essence, and Crescent Shard.
- Tier
- S+
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Extreme
- level
- 12,000
- HP
- 1,250,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only (1x Upper Seal + 700,000 Money + 700 Gems)
Strongest Shinobi
A 2 billion HP open-world boss on Ninja Island, added in the Massive Update (March 25, 2026). Based on Madara Uchiha. Spawns automatically every 6 minutes at the far end of Ninja Island (opposite the teleport spawn point). Drops the Battlefield Warlord title (1.5%, 100-kill pity), required for the Strongest Shinobi fighting style unlock chain. Level 12,000+ recommended.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Extreme
- level
- 12,000
- HP
- 2,000,000,000
- encounter type
- World boss
- access / respawn
- ~6 minutes (open world auto-spawn)
Atomic Boss (Cid)
A 2 billion HP summonable boss on Lawless Island, added in the Massive Update (March 25, 2026). Summoned at the Atomic Boss Summoner NPC using Abyss Sigils (Normal=1, Medium=2, Hard=3, Extreme=4). Drops the S+ tier Atomic Outfit accessory (1.23%) and materials needed to purchase the Atomic Sword (Cid V2) from the Atomic Seller NPC. Abyss Sigils drop from Arena Fighter mobs on Lawless Island and Ninja mobs on Ninja Island. Level 12,000+ recommended.
- Tier
- S+
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Extreme
- level
- 12,000
- HP
- 2,000,000,000
- encounter type
- Summon boss
- access / respawn
- Summon only (Abyss Sigils required)
Ice Queen
Ice Queen is a Boss Island summon with Normal, Medium, Hard, and Extreme modes. HP ranges from 1,650,000,000 on Normal to 32,500,000,000 on Extreme. Each mode uses a different Frost Relic, Money, and Gem cost. Drops include materials for the Ice Queen sword and the Frost Empress title.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Normal, Medium, Hard, Extreme
- level
- -
- HP
- Normal 1,650,000,000; Medium 5,000,000,000; Hard 13,500,000,000; Extreme 32,500,000,000
- encounter type
- Summon boss
- access / respawn
- Boss Island summon: Normal uses 1 Frost Relic, 750,000 Money, and 750 Gems; Medium uses 2 Frost Relics, 1,000,000 Money, and 1,000 Gems; Hard uses 3 Frost Relics, 1,250,000 Money, and 1,250 Gems; Extreme uses 4 Frost Relics, 1,000,000 Money, and 1,000 Gems.
Luffy
Luffy spawns at The Sunny teleport in Sea 2 every 15 minutes. The fight enters stronger phases at 75%, 50%, and 25% HP.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- -
- level
- -
- HP
- -
- encounter type
- World boss
- access / respawn
- The Sunny teleport in Sea 2; spawns every 15 minutes.
Sun God
Sun God appears on Slayer Island every 15 minutes and has 1,500,000,026,624 HP. Its drops include the Sun God Sword, Sun Outfit, and materials for the Yoriichi sword route.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- -
- level
- -
- HP
- 1,500,000,026,624
- encounter type
- World boss
- access / respawn
- Slayer Island; world boss spawns every 15 minutes.
Frost Empress
Frost Empress appears on Frost Island every 5 minutes and has 950,000,025,600 HP. Its drops include the Frozen Monarch title, Soul Fragment, Bankai Essence, and Frozen Outfit.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- -
- level
- -
- HP
- 950,000,025,600
- encounter type
- World boss
- access / respawn
- Frost Island; world boss spawns every 5 minutes.
King of Heroes V2
King of Heroes V2 appears in Hero Kingdom every 5 minutes and has 1,249,999,978,496 HP. Its drops include the King of Babylon title, guaranteed materials, Brisbane Armor, and Sword of Rupture.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- -
- level
- -
- HP
- 1,249,999,978,496
- encounter type
- World boss
- access / respawn
- Hero Kingdom; world boss spawns every 5 minutes.
Lightning
Lightning appears on the Flying Ship every 10 minutes and has 1,562,500,005,888 HP. It drops Lightning V2 materials, Taiko Drums, Golden Staff, and the Thunder God title.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- -
- level
- -
- HP
- 1,562,500,005,888
- encounter type
- World boss
- access / respawn
- Flying Ship; world boss spawns every 10 minutes.
Spirit Warrior
Summon Spirit Warrior on Blue Planet with Spirit Keys. Its drops include the Spirit Outfit and World Protector title.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Normal, Medium, Hard, Extreme
- level
- -
- HP
- -
- encounter type
- Summon boss
- access / respawn
- Summon at the Spirit Warrior Summoner on Blue Planet with 1 to 4 Spirit Keys by difficulty.
Black Reaper
Summon Black Reaper on Isolation Island with Reaper Keys. Its HP and drop rates rise across Normal, Medium, Hard, and Extreme modes.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- Normal, Medium, Hard, Extreme
- level
- -
- HP
- Normal 50B; Medium 100B; Hard 300B; Extreme 800B
- encounter type
- Summon boss
- access / respawn
- Summon on Isolation Island with 1 to 4 Reaper Keys by difficulty.
Dante
Dante is manually summoned on Dante Island with Demonic Shards from the Anos boss. The fight drops Dante's sword and title and has no pity counter.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- -
- level
- -
- HP
- -
- encounter type
- Summon boss
- access / respawn
- Manually summon on Dante Island with Demonic Shards from the Anos boss; the summon sends the player into the castle.
Toji
Toji Boss is an encounter added with the Toji update.
- Tier
- -
- Type
- -
- boss stage
- Endgame Islands
- difficulty
- -
- level
- -
- HP
- -
- encounter type
- -
- access / respawn
- -
Boss access is as important as boss strength
Some bosses respawn on a timer. Others need keys, boss materials, dungeon access, world-boss spawns, or sea-beast conditions. A boss with better drops can still be a worse short-term farm if the account cannot summon it consistently.
Drops decide the route
A boss is worth farming when its drops connect to a real upgrade. Jinwoo helps early Shadow Monarch progress, Aizen connects to Mirage Pendant and Hogyoku Fragment, Sea Beasts feed Dragon Goddess materials, and Atomic Boss points toward high-end titles, outfits, and crafting materials.
FAQ
What boss should I farm first in Sailor Piece?
Start with bosses that match your current island route and level. Early bosses like Jinwoo, Yuji, Gojo, and Sukuna feed key materials before endgame summon routes become realistic.
Why do some bosses show level 0?
Some bosses do not have a listed level requirement. Use HP, island stage, and access route to gauge difficulty.
Are Sea Beasts normal bosses?
No. Kraken and Sea Serpent are sea-creature encounters. Their spawn rules and bounty requirements make them different from normal island bosses.
What should I check before farming an endgame boss?
Check the access route first. Summon cost, key requirement, dungeon gate, or world-boss spawn timing can matter more than the drop list.
