Blox Fruits: How to Complete the Prison Warden Cloak Secret

The Prison in the First Sea keeps a coat locked behind a gate at the top of its keep, and touching it starts a fight. The whole thing runs on one item you can walk past without noticing: the Cell Block Key, sitting out in the courtyard. Pick it up, climb the keep, and the office at the top opens.

Quick answer: Grab the Cell Block Key from the wooden platform in the prison courtyard, use it to unlock the Office Gate on the top floor of the keep, then interact with the cloak on the chair and defeat Megalo Guard [Lv. 250] to receive the Pink Coat and Black Cape.

Prison cloak secret requirements and rewards

The Prison sits west of Fountain City and normally serves players between Levels 190 and 250. The cloak itself has no level gate, but the boss it spawns is Level 250, so treat that as the real entry requirement. Everything happens inside the fortress, so you do not need to leave the island once you dock.

Detail	Value
Location	Prison, First Sea (west of Fountain City)
Island level range	190–250
Required item	Cell Block Key
Locked object	Office Gate, top floor of the keep
Boss	Megalo Guard [Lv. 250]
Rewards	Pink Coat, Black Cape

Blox Fruits gameplay at the Prison island in the First Sea — The Prison in the First Sea, where the cloak secret plays out from courtyard to top floor.

Cell Block Key to cloak: the full sequence

Sail to the Prison and head through the main gate into the courtyard. Ignore the Prisoners and Dangerous Prisoners for now and search the wooden platforms in the open area between the walls. You are looking for a small pickup labelled Cell Block Key.

Walk onto the wooden platform and interact with the key to collect it. It goes straight into your inventory, and no prompt or cutscene fires at this point. Nothing else on the island changes until you reach the gate.

Enter the keep in the middle of the island and climb to the top floor. The route runs up through the interior walkways rather than around the outer wall, so keep moving upward each time you reach a landing.

Player crossing a prison walkway with the Kitsune ability bar visible on screen — Climbing the walkways inside the keep toward the top floor, with the Kitsune ability bar on screen.

At the top, find the barred Office Gate and interact with it while holding the Cell Block Key. The gate unlocks and opens on the spot. If it stays shut, you are missing the key.

Step through the doorway, go up the short flight of stairs, and look for the coat draped over the chair. Interacting with the room triggers dialogue about the cell being empty, with lines such as “This is Don’s… cell…?” and “The Warden wasn’t keeping Megalo locked up at all! He was just keeping him comfortable”.

Player standing in an arched doorway at the top of the prison keep — The arched doorway at the top of the keep, just past the unlocked Office Gate.

Interact with the coat again to take it. That is the trigger, and Megalo Guard [Lv. 250] spawns immediately in the office with you.

“That coat belongs to the boss… don’t touch what’s his.”

Beating Megalo Guard (Lv. 250)

Megalo Guard is a proper boss, not a filler enemy, and the fight happens in the cramped office rather than out in the open. The room leaves little space to kite, so bring damage you can land at close range and be ready to reposition around the furniture. A well-levelled fruit with area attacks, such as Kitsune, clears the fight quickly.

Player swinging a glowing sword with a blue effect during the office fight — Fighting inside the office, with the second hotbar slot active during the Megalo Guard encounter.

Note: the guard makes it clear he is standing in for someone else, telling you “The Don isn’t here to deal with you himself. I’ll do him a favor taking care of you myself.” The coat’s owner never appears in the room.

How to confirm the cloak secret is complete

The moment Megalo Guard goes down, two on-screen messages appear: Took <Pink Coat> and Stored <Black Cape>. Both items land in your inventory, and the office no longer has anything to interact with. If you only see the dialogue and no reward text, the boss is still alive somewhere in the room.

Blox Fruits gameplay inside the Prison keep after the boss fight — Inside the keep after the fight, when the Pink Coat and Black Cape have been handed over.

Why the cloak secret does not trigger

There are only a few reasons this stalls, and all of them come down to order. The Office Gate will not open without the Cell Block Key in your inventory, so if you climbed straight to the top floor, go back down to the courtyard platforms and collect it. Reading the dialogue in the office also does not count as completing anything; the guard only spawns when you try to take the coat off the chair. And the rewards only drop on the boss’s death, so leaving the island or dying mid-fight means starting the encounter again.

Once you have both pieces, the office stays empty and there is nothing left to farm in that room. The rest of the island still runs as normal, with Warden, Chief Warden, and Swan on their usual spawns for anyone grinding levels or money in Blox Fruits.