Every Sailor Piece Boss, Where to Find Them, and What They Drop

Sailor Piece on Roblox splits its bosses into two distinct categories. Mob Bosses are level-gated mini-bosses scattered across early and mid-game islands that reward Money and EXP. World Bosses are the real prize — tougher fights that drop rare materials, accessories, rerolls, and exclusive titles. Some World Bosses spawn on automatic timers, while others require you to spend specific keys, currency, and Gems to summon them through NPCs.

Quick answer: Boss Keys, which you need to summon several Boss Island bosses, are obtained by completing quests from Quest NPCs on various islands. Boss Tickets drop from most World Bosses and can be exchanged at the Boss Ticket Exchange NPC for weapons and fighting styles.

Mob Bosses — Locations and Level Requirements

Mob Bosses exist purely as grind targets. They only drop Money and EXP, so treat them as stepping stones toward the level thresholds you need for harder content. Each one is tied to a specific island and unlocks once you hit the required level.

World Bosses That Auto-Spawn on Timers

Several World Bosses respawn automatically on server-side timers. You don't need any items to fight them — just show up at the right island and wait. These are the most farmable bosses in the game and the easiest way to stock up on rerolls and Boss Tickets.

Sukuna — Shibuya Station (every 7 min 30 sec)

Sukuna drops a wide spread of useful items. The Malevolent Key at 30% is particularly important because it's the entry cost for the Strongest In History boss on Shinjuku Island. Other notable drops include Cursed Finger (20%), Dismantle Fang (8%), Sukuna Collar accessory (4%), Crimson Heart (2.5%), and the Curse King title (4%).

Gojo — Shibuya Station (every 7 min 30 sec)

Gojo shares Shibuya Station with Sukuna and runs on the same timer interval. His Limitless Key (30%) unlocks the Strongest of Today fight on Shinjuku Island. He also drops Void Fragment (20%), Limitless Ring (8%), Gojo Blindfold accessory (5%), Infinity Core (3%), and the Honored One title (5%).

Yuji — Shibuya Station (every 5 min)

Yuji spawns faster than the other Shibuya bosses. His unique drops include Energy Core (25%), Flash Impact (9%), Yuji Hair accessory (5%), Divergent Pulse (4%), and the Living Weapon title (5%). Haki Color Reroll sits at 45% and Race Reroll at 35%.

Jinwoo — Sailor Island (every 8 min 30 sec)

Jinwoo has one of the longer auto-spawn timers, but compensates with generous drop rates. Haki Color Reroll lands at 80%, and Abyss Edge drops at 17.5%. Rarer rewards include Dark Ring With (7%), Jinwoo Cape accessory (3%), Shadow Heart (2%), and the Shadow Monarch title (3%).

Alucard — Sailor Island (every 5 min)

Alucard alternates with Jinwoo on Sailor Island, so only one of them is active at a time. He doesn't drop Haki Color Rerolls, but Race Reroll (85%) and Trait Reroll (80%) rates are among the highest of any boss. Unique loot includes Soul Amulet (8%), Alucard Coat accessory (3%), Casull (2%), Blood Ring (2%), and the Vampire King title (2.5%).

Ragna — Christmas Island (every 5 min)

Ragna is a solid farm target with a fast respawn. Wyrm Brand drops at 25%, Black Frost at 9%, Silver Requiem at 3.5%, Ragna Sigil at 2%, and the Dragon Slayer title at 1.5%.

Aizen — Hueco Mundo (every 7 min 30 sec)

Aizen stands out for having a guaranteed Haki Color Reroll (100%) and an 85% Race Reroll rate. His rare drops are Mirage Pendant (20%), Illusion Prism (8%), Reiatsu Core (3%), Aizen Haori accessory (2%), Hogyoku Fragment (1.2%), and the Manipulator title (2%).

Madoka — Valentine Island (every 5 min)

Madoka guarantees Race Reroll, Trait Reroll, and 1–2 Hearts on every kill. Boss Tickets drop at 55% and Dungeon Keys at 45%. The rarest rewards are Divine Fragment (6%), Sacred Bow (4%), Radiant Core (2%), Ultimate Wings (1.5%), Pink Gem (0.75%), and the Star Maiden title (1.2%).

Boss Island Summons — Key, Money, and Gem Costs

Boss Island houses an NPC called the Boss Summoner. You talk to this NPC and pay a combination of Boss Keys, Money, and Gems to call in a specific boss. Each fight scales in cost, and the more expensive bosses tend to drop rarer materials.

Saber is the cheapest entry point and guarantees a Boss Ticket every kill, making it an efficient farm. Ichigo is the most expensive standard summon, but drops materials like Soul Fragment and Spiritual Core that don't appear anywhere else. Gilgamesh requires a Divine Grail instead of Boss Keys, and his drop rates scale with the difficulty you select.

Special Key Summons — Shinjuku, Academy, and Slime Islands

Some World Bosses require specific keys obtained from other boss fights or quests rather than generic Boss Keys.

Strongest In History — Shinjuku Island

Summoned via the Strongest Boss Summoner NPC using 1 Malevolent Key (dropped by Sukuna at 30%). Drops scale with difficulty and include Awakened Cursed Finger (15–25%), Vessel Ring (6–8%), Malevolent Soul (2–3%), Divine Wheel (1.25–2%), Cursed Flesh (0.65–0.9%), and the Disgraced One title (1–1.5%).

Strongest of Today — Shinjuku Island

Uses the same NPC but costs 1 Limitless Key (dropped by Gojo at 30%). Difficulty-scaled drops include Reversal Pulse (15–25%), Six Eye (6–8%), Blue Singularity (2–3%), Gojo Haori (1.25–2%), Infinity Essence (0.65–0.9%), and the Strongest Sorcerer title (1–1.5%).

Anos — Academy Island

Summoned at Academy Island's Boss Summoner NPC for 1 Calamity Seal. Drops include Demonic Fragment (11.5–20%), Demonic Shard (4.5–6.5%), Destruction Eye (1–1.5%), Imperial Mark (0.5–0.75%), Anos Outfit (0.75–1.2%), and the Demon King title (1–1.5%). Higher difficulty increases every drop rate.

Rimuru — Slime Island

Talk to the Rimuru Summoner NPC and spend 1 Slime Key. Difficulty-scaled drops are Sage Pulse (13.5–22.5%), Tempest Seal (5.5–7.5%), Slime Remnant (1.75–2.8%), Slime Wings (1.25–2%), Slime Core (0.55–0.8%), and the Demon Lord title (0.9–1.35%).

Dungeon-Based World Bosses

Two World Bosses only appear inside dungeon instances, triggered by clearing specific waves.

Shadow — Shadow Dungeon

Shadow spawns after you clear Wave 5, Wave 10, and Wave 15 of the Shadow Dungeon. Every drop rate scales with the difficulty you choose. Umbral Capsule ranges from 12.5% to 35%, Void Seed from 4.5% to 15%, Shadow Essence from 2% to 4.5%, Shadow Cloak from 0.85% to 2.5%, Atomic Core from 0.75% to 3%, and the Eminence in Shadow title sits at a flat 1%.

Shadow Monarch — Double Dungeon (Boss Island)

Shadow Monarch appears at Wave 5, Wave 10, and Wave 15 of the Double Dungeon. Difficulty-scaled drops include Monarch Core (6.75–12%), Monarch Essence (2.75–6.5%), Kamish Dagger (0.75–1.4%), Shadow Crystal (0.5–1%), Monarch Armor (0.75–1.5%), and the King Of Shadows title (0.8–1.15%).

How to Get Boss Keys

Boss Keys are the primary gating resource for Boss Island summons. You earn them by completing quests from Quest NPCs spread across the game's islands. Running a loop of quests across multiple islands is the most efficient farming method — finish quests on one island, sail to the next, and repeat. Each completed quest has a chance to reward a Boss Key, so consistency matters more than luck on any single run.

How Boss Tickets Work

Boss Tickets are a secondary currency dropped by most World Bosses. Saber, Qin Shi, and Ichigo guarantee one ticket per kill (100%), while other bosses like Aizen (45%), Alucard (40%), Jinwoo (35%), and Ragna (30%) have lower but still reasonable rates. Take your accumulated tickets to the Boss Ticket Exchange NPC to trade them for weapons and fighting styles. If you're farming tickets specifically, Saber's low summon cost and guaranteed drop make it the most efficient target.

Sailor Piece continues to add new bosses with game updates, so the roster and drop tables may expand over time. For now, the most efficient farming loop depends on what you need — auto-spawn bosses for rerolls and keys, Boss Island summons for guaranteed tickets, and dungeon clears for the rarest difficulty-scaled materials.