Bosses are the big, tough enemies in Grand Piece Online, the Roblox game inspired by One Piece. They hit much harder than regular enemies, so you can't just run in and swing. Beating one can earn rare loot, including Devil Fruits, and knowing how a boss appears and how it fights is what separates a quick win from a wasted trip.
Encounter
First Sea
Bandit Boss
- Location
- Town of Beginnings
- Notable Drops
- Bandit Eyepatch
- Summon / Trigger
- Respawns about 40 seconds after defeat.
Lucid
- Location
- Sandora
- Notable Drops
- Bazooka
- Summon / Trigger
- Respawns about 10 minutes after defeat.
Axe Hand Logan
- Location
- Shell's Town
- Notable Drops
- Metal Jaw
- Summon / Trigger
- Respawns about 10 minutes after defeat.
Star Clown
- Location
- Orange Town
- Also Known As
- -
- Notable Drops
- Buggy's Cape
- Star Clown's Cape
- Star Clown's Hat
- Star Clown's Outfit
- Summon / Trigger
- Respawns about 10 minutes after defeat.
Gorilla King
- Location
- Sphinx Island
- Also Known As
- -
- Notable Drops
- Gorilla King Crown
- Summon / Trigger
- Respawns about 10 minutes after defeat.
Saw Shark
- Location
- Shark Park
- Also Known As
- Arlong
- Notable Drops
- Kiribachi
- Summon / Trigger
- Respawns about 9 minutes after defeat.
Head Guardian
- Location
- Sky Castle
- Notable Drops
- Skyblue Katana
- Guardian's Helmet
- Summon / Trigger
- -
Bruno
- Location
- The Tree
- Notable Drops
- Burn Bazooka
- Summon / Trigger
- -
Malcolm
- Location
- Malcolm's Lair
- Notable Drops
- Shotgun
- Summon / Trigger
- Respawns about 10–15 minutes after defeat.
Thunder God
- Location
- Golden City
- Also Known As
- Enel
- Notable Drops
- Golden Staff
- Tomoe Drums
- Summon / Trigger
- -
Gravito
- Location
- Gravito's Fort
- Also Known As
- -
- Notable Drops
- Gravity Blade
- Gravito's Cape
- Hoverboard
- Meteor Strike (Grip)
- Summon / Trigger
- -
Ryu
- Location
- Ryu's Palace, Fishman Island
- Also Known As
- -
- Notable Drops
- Ryu's Katana
- Shark Necklace
- Summon / Trigger
- Respawns about every 10–15 minutes.
Neptune
- Location
- Neptune's Throne, Fishman Island
- Notable Drops
- Neptune's Trident
- Neptune's Crown
- Summon / Trigger
- Respawns about every 10 minutes; may also appear as a random boss on Wave 5 of the Colosseum Raid.
Flame Admiral Zeke
- Location
- Marine Base G-1
- Notable Drops
- Fire Essence
- Marine Captain's Cape
- Summon / Trigger
- Respawns about every 10 minutes.
Captain Zhen
- Location
- Marine Base G-1
- Notable Drops
- Bisento
- Captain Zhen's Cape
- Summon / Trigger
- Equip a Fire Essence dropped by Flame Admiral Zeke, then speak to Captain Zhen to summon him. He may also appear as a random boss on Wave 5 of the Colosseum Raid.
Sea Serpent
- Location
- Rough Waters
- Also Known As
- Sea King
- Notable Drops
- Seabeast Katana
- Slayer's Armor Set
- Slayer's Mask
- Sea Serpent's Core
- Devil Fruit
- Summon / Trigger
- Spawns in First Sea Rough Waters when a player ship is nearby; a player needs any bounty, and higher bounty improves the chance.
Radiant Admiral
- Location
- Marine Base G-1
- Also Known As
- Kizaru
- Notable Drops
- Radiant Admiral's Outfit
- Radiant Shades
- Radiant Admiral's Cape
- Pika Grip
- Legendary Fruit Chest Blueprint
- Summon / Trigger
- Scheduled world boss; respawns every 30 minutes of real time.
Ashen
- Location
- Logue Town
- Also Known As
- -
- Notable Drops
- Jitte
- Ashen Outfit
- Ashen Cape
- Summon / Trigger
- Appears during the Logue Town prisoner execution event; freeing the prisoner aggros Ashen.
Encounter
Second Sea
Crab King Cho
- Location
- Crab Cave, Desert Kingdom
- Notable Drops
- Crab Cutlass
- Cho's Crown
- Summon / Trigger
- Respawns about every 10 minutes; may also appear as a random boss on Wave 5 of the Colosseum Raid.
Pharaoh Akshan
- Location
- Pharaoh’s Castle, Desert Kingdom
- Notable Drops
- Golden Hook
- Pharaoh Akshan's Cape
- Summon / Trigger
- Collect and equip the Heart of Sol, Cup of Vedas, and Seer of Zaro, place them at the statue beside Pharaoh’s Castle, then enter the castle. He may also appear as a random boss on Wave 5 of the Colosseum Raid.
Musashi
- Location
- Sashi Island
- Notable Drops
- Musashi’s Crimson Katana
- Musashi’s Rose Katana
- Musashi’s Hat
- Musashi’s Karuta
- Summon / Trigger
- After fully unlocking 1 Sword Style, pay 10,000 Peli to spar with Musashi.
Kraken
- Location
- Rough Waters
- Notable Drops
- Mysterious Book
- Book of Spirits
- Kraken Armor Set
- Kraken Cape
- Kraken Blade
- Kraken Katana
- Kraken Core
- Devil Fruit
- Summon / Trigger
- Spawns in Second Sea Rough Waters when a player boat is nearby; higher bounty speeds spawns. Two or more players in the zone trigger a Great Kraken instead.
Great Kraken
- Location
- Rough Waters
- Notable Drops
- Devil Fruit
- Summon / Trigger
- Spawns in Second Sea Rough Waters when at least two players are in the zone at the same time.
Megalodon
- Location
- Rough Waters
- Notable Drops
- Megalodon Tooth
- Megalodon Armor Set Blueprint
- Megalodon Helmet Blueprint
- Boneshiver Blueprint
- Legendary Fruit Chest Blueprint
- Devil Fruit
- Summon / Trigger
- In Rough Waters, use 1–2 Shark Blood Bottles to summon one; fishing there can also attract one. With a boat and enough bounty, it may replace a Kraken after the spawn timer.
Ghost Princess
- Location
- Thriller Bark
- Notable Drops
- Ghost Explosion (Grip)
- Ghost Princess's Umbrella
- Ghost Princess's Outfit
- Ghost Princess's Capelet
- Ghost Princess's Crown
- Summon / Trigger
- Respawns 10 minutes after defeat, or 15 minutes on new servers.
Ryuma
- Location
- Thriller Bark
- Notable Drops
- Ryuma's Soul
- Ryuma's Scarf
- Ryuma's Outfit
- Shusui
- Summon / Trigger
- Respawns about every 10–15 minutes; may also appear as a random boss on Wave 5 of the Colosseum Raid.
Borj
- Location
- Borj's Room, Thriller Bark
- Notable Drops
- Borj's Soul
- Borj's Armor
- Knight's Gauntlet
- Summon / Trigger
- Respawns about every 10 minutes 20 seconds; may also appear as a random boss on Wave 5 of the Colosseum Raid.
Moria, The Shadow King
- Location
- Thriller Bark, Moria's Throne Room
- Also Known As
- -
- Notable Drops
- Moria's Tophat
- Moria's Necklace
- Bat Swarm
- Moria's Scissors
- Moria's Outfit
- Summon / Trigger
- Fuse Ryuma’s Soul and Borj’s Soul at the door to Moria’s Throne Room.
Soul King
- Location
- Soul King's Ship
- Also Known As
- Brook
- Notable Drops
- Soul King's Outfit
- Soul King's Tophat
- Soul King's Violin
- Soul Cane
- Soul King's Guitar (Rockstar form)
- Soul King's Shades (Rockstar form)
- Soul King's Top Hat (Rockstar form)
- Soul King's Rockstar Outfit
- Soul King's Scarf (Rockstar form)
- Summon / Trigger
- A sea event that spawns every hour; Soul King Rockstar has a 10% chance to appear instead.
Pica
- Location
- Rose Kingdom
- Also Known As
- -
- Notable Drops
- Pica's Helmet
- Pica's Armor
- Pica Smash (Grip)
- Summon / Trigger
- Kill all four Donmingo Family members around Rose Kingdom.
Donmingo
- Location
- Rose Kingdom
- Notable Drops
- Donmingo's Shades
- Donmingo's Cape
- Donmingo's Outfit
- String Dissection (Grip)
- Legendary Fruit Chest Blueprint
- Summon / Trigger
- Kill the four Donmingo Family members, defeat the Pica they summon, then wait 15 minutes for Donmingo to appear at his mansion.
Law
- Location
- Factory
- Notable Drops
- Law's Cap
- Law's Outfit
- Law's Cape
- Ope Scramble (Grip)
- Kikoku
- Legendary Fruit Chest Blueprint
- Summon / Trigger
- Appears at Stage 4 of the Factory Raid.
Lucy
- Location
- Rose Kingdom
- Notable Drops
- Lucy's Outfit
- Lucy's Helmet
- Lucy's Cape
- Legendary Fruit Chest Blueprint
- Summon / Trigger
- Guaranteed to appear on Wave 10, the final wave of the Colosseum Raid.
Bellom
- Location
- Rose Kingdom
- Also Known As
- -
- Notable Drops
- Bellom's Glasses
- Bellom's Outfit
- Summon / Trigger
- May appear as a random boss on Wave 5 of the Colosseum Raid.
Roger
- Location
- Umi Island
- Also Known As
- -
- Notable Drops
- Roger's Ace
- Roger's Outfit
- Roger's Hat
- Legendary Fruit Chest Blueprint
- Summon / Trigger
- Scheduled world boss; spawns every 90 minutes of real time.
Hawk Eye
- Location
- Umi Island
- Also Known As
- Mihawk
- Notable Drops
- Hawk Eye's Hat
- Hawk Eye's Outfit
- Triple Strongest Slash Scroll
- Dark Blade
- Legendary Fruit Chest Blueprint
- Summon / Trigger
- Scheduled world boss; spawns every 120 minutes of real time.
Juzo the Diamondback
- Location
- Turtleback Cave
- Notable Drops
- Kira Kira no Mi
- Turtleback Helmet
- Turtleback Armor
- Mythical Fruit Chest
- Summon / Trigger
- First spawn is 10 minutes after the server starts; later spawns are about 15 minutes apart.
Juice Empress
- Location
- Mirror World, Whole Cake Island
- Notable Drops
- Juice Empress's Cape
- Juice Empress's Helmet
- Juice Empress's Outfit
- Helix Skewer
- Summon / Trigger
- Appears on Floor 4 of the Whole Cake raid after the three Chess Soldier waves.
Big Mama
- Location
- Mirror World, Whole Cake Island
- Notable Drops
- Mama's Outfit (Female)
- Mama's Outfit (Male)
- Big Mama's Hat
- Big Mama's Cape
- Soul Cleaver
- Summon / Trigger
- The boss fight starts in Room 5 of the Whole Cake Mirror World after clearing the preceding rooms.
Mochi Emperor
- Location
- Mirror World, Whole Cake Island
- Notable Drops
- Mochi Emperor's Outfit
- Mochi Emperor's Scarf
- Mochi Trident
- Summon / Trigger
- Appears in the Mirror World after Big Mama is defeated; defeat Mochi Emperor to reopen the Whole Cake Tower.
Pedro
- Location
- -
- Notable Drops
- Moonfang Rapier
- Pedro's Outfit
- Pedro's Cape
- Summon / Trigger
- -
Biscuit Commander
- Location
- -
- Notable Drops
- Pretzel Longsword
- Biscuit Commander's Outfit
- Biscuit Commander's Shoulder Cape
- Summon / Trigger
- -
Encounter
Dungeon
Sphinx
- Location
- Impel Down Raid
- Summon / Trigger
- Impel Down Raid Floor 2 boss; appears after the lever is pulled in Wild Hell.
Impel Down Elite High Guard
- Location
- Impel Down Raid
- Summon / Trigger
- Impel Down Raid Floor 2 boss; appears immediately after Sphinx is defeated.
Jailer Han
- Location
- Impel Down Raid
- Summon / Trigger
- Impel Down Raid Floor 3 boss; appears after the gate guards are defeated.
Head Jailer of Impel Down
- Location
- Impel Down Raid
- Summon / Trigger
- Impel Down Raid Floor 3 boss; appears after Jailer Han and the following enemy waves are defeated.
Blugori
- Location
- Impel Down Raid
- Summon / Trigger
- Impel Down Raid Floor 4 boss; appears at the end of Freezing Hell.
Vera
- Location
- Impel Down Raid
- Summon / Trigger
- Impel Down Raid Floor 5 boss; appears in the final room of Blazing Hell.
Dragon Emperor
- Location
- Dragon Emperor Dungeon, Blossom Falls
- Notable Drops
- Thunder Club
- Dragon Emperor's Cape
- Dragon Emperor's Outfit
- Dragon Emperor's Gourd
- Summon / Trigger
- The final boss at the end of the Dragon Emperor Dungeon on Blossom Falls.
King
- Location
- -
- Notable Drops
- King's Mask
- King's Outfit
- Summon / Trigger
- Mini-boss stage inside the Dragon Emperor Dungeon, before the final Dragon Emperor encounter.
Encounter
Seasonal
Flying Santa
- Location
- Santa Island
- Availability
- Seasonal event
- Notable Drops
- Red Gift (2023)
- Red or Green Gift (2024)
- Blue Gift (2025)
- Summon / Trigger
- Unkillable event encounter; deal about 200–400 damage to make Santa throw a gift.
Santa
- Location
- Santa's Lair
- Availability
- Removed
- Notable Drops
- Santa's Hat
- Santa's Candy Cane
- Summon / Trigger
- Legacy seasonal boss at Santa’s Lair during the Christmas 2020 event; separate from Flying Santa/Santa’s Sleigh.
Elo The Bunny
- Location
- Elo's Island
- Availability
- Seasonal event
- Notable Drops
- Golden Egg (Star Shades)
- Pink Egg (Bunny Hoodie)
- Rainbow Egg (Rainbow Halo)
- Egg of Wonder (Wonder Balloons)
- Mini Bunny Egg (Mini Bunny Summoner)
- Elo's Egg (Elo's Hammer)
- Summon / Trigger
- Spawns about 8 minutes after the server starts.
Ba'al
- Location
- Transylvania
- Availability
- Seasonal event
- Notable Drops
- Ba'al's Cape
- Head of Ba'al
- Hollow's Fang
- Summon / Trigger
- Collect eight each of Zombie Arms, Legs, and Skulls, then place them in their matching bowls at the altar outside Transylvania’s Inner Gates.
Demon Jester
- Location
- Abyss
- Availability
- Seasonal event
- Notable Drops
- Demon Jester's Scythe
- Jester Box
- Jester's Hat
- Jester's Outfit
- Summon / Trigger
- Use Ba’al’s Core at the Abyss arena pedestal. Open the Abyss portal by using the Witch’s Key and boiling 20 Zombie parts in the Witch’s House cauldron.
Kelvin, The Nutcracker
- Location
- Winter Wonderland
- Availability
- Seasonal event
- Notable Drops
- Gift of Shield (Festival Shield)
- Summon / Trigger
- Christmas 2021 event boss at Gift Factory Basement in Winter Wonderland.
Krampus, The Ravager
- Location
- Winter Cave
- Availability
- Seasonal event
- Notable Drops
- Gift of Outfit (Santa’s Outfit)
- Gift of Tall Hat (Tall Elf Hat)
- Gift of Horns (Reindeer Horns)
- Gift of Rudolph (Rudolph's Hat)
- Gift of Beard (Santa's Beard)
- Gift of Armor (Bell Armor)
- Gift of Scarf (Peppermint Scarf)
- Gift of Tree (Festival Tree Hat)
- Gift of Fruit (Devil Fruit)
- Gift of Lancer (Festival Lancer)
- Summon / Trigger
- Collect 15 Gingerbread Giftboxes from Gingerbread Men and use them to open the portal through the sled.
Leo
- Location
- Cupid's Dungeon
- Availability
- Seasonal event
- Notable Drops
- Wings of Leo
- Leo's Outfit
- Leo's Blazing Scarf
- Summon / Trigger
- Appears on Wave 7 of the legacy Cupid’s Dungeon.
Cupid Queen
- Location
- Cupid's Dungeon
- Availability
- Seasonal event
- Notable Drops
- Cupid's Headband
- Cupid Boat
- Cupid Queen's Wings
- Cupid Wand
- Cupid's Battleaxe
- Cupid Queen's Outfit
- Exalted Cupid Queen’s Wings
- Cupid's Bow
- Exalted Cupid Queen’s Outfit
- Cupid Queen's Scarf
- Summon / Trigger
- Final boss on Wave 8 of the 2022 Cupid’s Dungeon and Floor 8 of the 2025 Cupid Dungeon.
Supreme Giftbox, Rocky
- Location
- Anniversary Dungeon
- Availability
- Seasonal event
- Notable Drops
- 2023 gift pool: Anniversary Dress 2023
- 2023 gift pool: Anniversary Suit 2023
- Rocky's Vicious Top Hat
- Rocky's Mysterious Hat
- 2023 gift pool: Firework Daggers
- 2023 gift pool: Firework Launcher
- 2023 gift pool: Prestige Firework Dagger
- 2023 gift pool: Prestige Firework Launcher
- 2025 gift pool: Supreme Giftbox Armor (Female)
- 2025 gift pool: Supreme Giftbox Armor (Male)
- 2025 gift pool: Supreme Giftbox Crown
- 2025 gift pool: Supreme Giftbox Helmet
- 2025 gift pool: Supreme Giftbox, Rocky Shoulder Pet
- 2025 gift pool: Mega-Pow
- 2025 gift pool: Chromatic All Seeing Eye
- 2025 gift pool: Anomalized Mega-Pow
- Summon / Trigger
- Final-area boss in the Anniversary Dungeon.
Cupid Queen (Blessed)
- Location
- Cupid Dungeon (2025)
- Availability
- Seasonal event
- Notable Drops
- Blessed Exalted Cupid Queen’s Wings
- Blessed Cupid's Bow
- Blessed Exalted Cupid Queen’s Outfit
- Blessed Cupid Queen's Scarf
- Summon / Trigger
- The 2025 Cupid Queen has a 1-in-250 chance to be Blessed, or 1-in-150 with the Cupid’s Nemesis title.
Blo the Bunny
- Location
- Blo's Island
- Availability
- Seasonal event
- Notable Drops
- Blo's Sledgehammer
- Blo's Costume
- Blo Egghead
- Blo's Explosive Egg (Grip)
- Summon / Trigger
- First spawns 10 minutes after the server starts; after defeat, respawns every 5 minutes.
Resurrected Ba'al
- Location
- Transylvania
- Availability
- Seasonal event
- Notable Drops
- Hollow's Halberd
- Resurrected Ba'al's Outfit (2023)
- Resurrected Ba'al's Outfit 2.0 (2025)
- Resurrected Ba'al's Head
- Summon / Trigger
- Summon at Transylvania using Wandering Souls collected from Spooksville.
True Demon Ba'al
- Location
- Hell, Transylvania
- Availability
- Seasonal event
- Notable Drops
- True Ba'al's Guard
- Hollow's Great Sword
- True Ba'al's Snake Head
- True Ba'al's Snake Fire (Grip)
- True Ba'al's Horns
- Hollow’s World Ender
- Prestige World Ender
- Endbringer Wings
- Endbringer Armor
- Summon / Trigger
- Appears in Hell after Resurrected Ba’al is defeated; enter the portal when its red indicator appears.
Love Empress
- Location
- Valentine Island
- Availability
- Seasonal event
- Notable Drops
- Flower Bouquet
- Flamingo Boat
- Summon / Trigger
- Seasonal boss at Valentine Island during the 2021 Valentine’s Day event.
Virtuous Cupid Queen
- Location
- Cupid Dungeon (2026)
- Availability
- Seasonal event
- Notable Drops
- Virtuous Cupid Queen's Outfit
- Virtuous Cupid Queen's Wings
- Love Boppers Headband
- Love Shades
- Cupid Boat
- Cupid's Wand
- Cupid's Battleaxe
- Cupid's Headband
- Dark Root
- SP Reset Essence
- Cupid's Chakram
- Cupid's Harp
- Prestige Cupid's Chakram
- Cupid Queen's Maid Outfit
- Cupid's All Seeing Eye
- Summon / Trigger
- Final boss in the last stage of Cupid Dungeon 2026.
Types of Bosses in Grand Piece Online
Bosses come in a few groups, and knowing which one you're facing tells you what to expect. Open-world bosses are out on the map, on islands and in the seas, and you can walk up and take them on. Sea event bosses are a group of their own, found out on the water. Trigger bosses stay hidden until you do something to call them out.
Dungeon and raid bosses wait at the end of a challenge built for a group, and seasonal bosses only show up during holiday events. Each group asks for a different approach, so it helps to know the difference before you head out.
How Boss Respawns and Triggers Work
Most open-world bosses come back on their own after you defeat them, though the wait differs from one boss to the next. Trigger bosses don't follow that pattern. They stay away until you complete something first, like defeating a set of NPCs or pushing up a factory's alarm.
Pica in Dressrosa is a good example. It doesn't show up until you've defeated the Donmingo family members scattered around the island, and defeating Pica is also what brings Donmingo out. Law appears after you set off a factory's alarm, and Lucy shows up once you clear the enemies at the colosseum.
Since triggers don't run on a clock, the smart move is to find out what a boss needs before you go. Wandering around a map looking for something that isn't there wastes time you could spend on the fight.
Boss Drops and Which Ones to Farm
Devil Fruits are the prize most players chase. Sea Serpents in Rough Waters can drop one, and dungeon runs are another main way to get them. Drops are random, so a boss you've beaten many times may still not give you the fruit you want, which makes it smart to pick your fights based on what you're missing.
Equipment matters just as much. Sea monsters and bosses can drop armor and weapon pieces, and the right piece can change how you play. Before you farm one, think about how you fight. A piece that suits your style or fills a gap in your gear is worth the effort, while one you can't use is just extra weight in your inventory.
In group fights, how much damage you deal can affect your rewards, so it pays to stay in the action. Hanging back and hoping for loot rarely works out.
Solo, Group and Raid Boss Fights
Most open-world bosses can be fought alone or with a few friends, and some are manageable solo once your build is ready. Dungeon and raid bosses are built for groups, and their rules are part of the challenge.
In dungeon mode, you work through waves of enemies, and bosses come up along the way. Clearing a run gives you a chance at Devil Fruits, which makes it one of the main ways to earn them.
The Impel Down raid is the clearest example of a group challenge. It has several floors, with strong guards along the way, and the group votes on a difficulty before entering. Pick the harder setting only when your group's gear and teamwork can handle it.
How to Beat Bosses in Grand Piece Online
Start with your stats. Balance your points between offense and defense instead of putting everything into one side, since a boss can punish a character that's too fragile or too weak to hurt it. Equip your best gear before you go, because a boss fight is a bad place to find out what your gear can do.
Choose your Devil Fruit or weapon with the boss in mind. Some fights go much faster with the right tool, and the wrong one can turn a short fight into a long one.
Learn the boss's attack patterns. Most bosses repeat certain moves, so watching a few rounds shows you when it's safe to hit and when to get out of the way. Use the space around you too. Walls, ledges and corners give you room to move, while standing still in the open makes you an easy target.
A solid approach is hit and back off. Step in, land a few hits, and pull back before the boss can counter. Block right after each combo so you're ready for the next attack, and keep moving rather than planting your feet.
Seasonal Bosses and Event Availability
Holiday bosses are tied to limited events, so they only appear while their event is running. Cupid Queen is one example of a holiday encounter.
Because seasonal bosses come and go, check whether the event is live before you plan a trip. Once it ends, the boss may be out of reach until the event returns.
FAQ
How do you summon a Megalodon in Grand Piece Online?
Megalodons are called out with Shark Blood, which is made from shark teeth. Pouring it into the water at Rough Waters is what sets off the spawn.
Is there a harder version of the Impel Down raid?
Yes. Before you start, the group votes on a difficulty, and the hardest setting, known as Nightmare mode, replaces some regular enemies with special bosses. Only pick it when your group's gear and teamwork can handle that.
Can you fight Pica by yourself?
Yes, Pica is one of the bosses many players take on alone. It's still a real fight, though, so balance your stats and bring a fruit or weapon that suits it, the same as any other boss.
