Assassin's Creed Black Flag Resynced Guide | How to Get Uncrowned Prince

Here’s a guide on how to get the Uncrowned Prince in Assassin's Creed Black Flag Resynced.

Game Guide by Ragib Rawnak on Jul 20, 2026

Tracking down legendary gear like Uncrowned Prince in Assassin's Creed Black Flag Resynced is one of the best parts of exploring the open ocean.

Here is how to get the legendary Uncrowned Prince rapier and the matching Guardian Beast figurehead.

Deep Water Exploration Settings

Hunting for this specific treasure requires spending a chunk of time underwater. You can use gear like a diamond trinket to help extend your breath meter, but there is an even easier method built right into the game options in Assassin's Creed Black Flag Resynced.

Here is how it works. Open up your main menu and select Options. Navigate over to the Gameplay tab. Scroll down until you find the setting for Unlimited Oxygen. Toggle it on.

Turning this setting on will not break your save file or block your progress. It takes the stress out of drowning so you can explore the sea floor at your own pace.

Finding the Hidden Spot

With your options chosen, take the wheel of your vessel and sail out across the ocean. You're heading for a large expanse of open ocean at the coordinates 501, 168 on your world map.

When you get close to these coordinates, you will notice it looks like a large, empty area of land and open water in Assassin's Creed Black Flag Resynced.

Place a pin directly on the 501, 168 coordinates to make navigation easier. Sail right up to your map marker. As soon as the custom pin icon disappears from your main screen, drop your anchor and prepare to swim.

Finding the Legendary Treasure Chest

Jump off the side of your ship and swim directly down into the water at the marker location in Assassin's Creed Black Flag Resynced.

Keep an eye out for rock formations and coral reefs along the bottom of the sea floor. The treasure container is a single underwater chest tucked away in this area. Because this is an unlisted community chest, it will not highlight when you scan with Eagle Vision, so you have to look closely for the physical box.

Swim up to the chest and open it to claim two distinct rewards. Uncrowned Prince: A legendary sword set. Guardian Beast: A legendary ship figurehead.

Weapon Stats and Unique Effects

The Uncrowned Prince rapiers are an incredibly solid early-game option because you can grab them without triggering hard campaign fights in Assassin's Creed Black Flag Resynced.

The sword set deals 25 base attack damage and gives you access to rapid thrusting attacks with long reach.

But here is the best part: the weapon features a unique passive effect that restores a portion of your health every time you break an enemy's defense. This makes it great for aggressive players who take on large groups of guards at once.

To use your new gear, open up your Inventory menu to equip the blades. For your new ship custom look, visit any Harbourmaster or use the captain's quarters on the Jackdaw to mount the Guardian Beast figurehead in Assassin's Creed Black Flag Resynced.

FAQ

Q. Do I need a diving bell to get the Uncrowned Prince rapier?

A. No, you can swim down directly from the surface of the water at the map coordinates without needing a diving bell or special progression.

Q. Why isn't the treasure chest showing up on my map or Eagle Vision?

A. This container is a hidden community chest. It does not appear on your map hud and will not glow when using Eagle Vision, so you have to spot the actual box on the sea floor.

Q. Where do I equip the Guardian Beast figurehead?

A. You can change your ship's appearance by talking to any Harbourmaster at a port or by interacting with the upgrade desk inside the Jackdaw's captain's quarters.

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