How to unlock the Uncrowned Prince Rapier in Assassin's Creed Black Flag Resynced, where to find the underwater chest, and whether the legendary rapier is worth using.
Image: IGDB
Store links: Assassin's Creed Black Flag Resynced on Steam
The Uncrowned Prince is hidden in an unmarked community chest
The Assassin's Creed Black Flag Resynced Uncrowned Prince Rapier is locked inside an unmarked underwater chest west of Kingston, according to multiple guide reports tracking Ubisoft's Community Treasure Hunt. That is the key tension with this weapon: it is a legendary rapier, but the game does not surface the chest through the usual map-cleanup loop once you synchronize nearby areas.
Nintendo Smash reports that Ubisoft released hints for three community chests containing special rewards, one of which leads to the Uncrowned Prince Rapier. Raider King and Game Rant also describe these rewards as part of a Community Treasure Hunt built around weekly Ubisoft clues, though both outlets say players found all three chests before the clue rollout had fully played out.
For players returning to Black Flag through Resynced, that makes the rapier feel like the kind of treasure the Caribbean should have more often: no icon trail, no checklist marker, no Eagle Vision shortcut. You sail to the right water, leave the Jackdaw, and hunt by eye.
How to unlock Uncrowned Prince Rapier in Black Flag Resynced
To unlock the Uncrowned Prince Rapier, sail to the Charlotte region west of Kingston and search the underwater chest at roughly coordinates 500,167. Nintendo Smash, TheGamer, and Raider King all list 500,167 as the location. Game Rant lists the same chest at 500,168, placing it in a small alcove in the Charlotte part of the map. In practical terms, those coordinates point to the same tiny stretch of coastline, so if your marker does not land directly over the chest, adjust slightly around that inlet.
If Kingston is already discovered, the fastest route is to fast travel there, take the Jackdaw west, and set a map marker on the coordinates so the compass gives you a clean heading. When you arrive, anchor the Jackdaw, leave the wheel, and dive into the water rather than looking for a shore chest.
The chest is underwater near coral. Nintendo Smash describes it as a glowing white chest, while TheGamer says players should swim around the coral and look for bubbles, with the white glow helping once you are close. Raider King adds that the chest does not appear on the map and says Eagle Vision does not reveal these community chests, a point echoed by Game Rant for the Community Treasure Hunt rewards. Treat this as a visual search, not a scan.
Where to look once you reach Charlotte
The search zone is small, but it is easy to overshoot because the chest is not marked like ordinary collectible cleanup. TheGamer places it in a small inlet on the main island directly west of Kingston, near a wall where two large cliff sections jut slightly out over the water. Once you dive, stay close to the coral and follow the bubble trail until the chest comes into view.
Nintendo Smash says the chest is on the southern shore of Charlotte, west of Kingston. Raider King describes the same reward chest as being west of Kingston at 500,167 and says it shines once you jump into the water. Game Rant places it near the Blue Hole shipwreck, in a small alcove in Charlotte, using the nearby 500,168 coordinate.
There is one small source conflict worth flagging. Nintendo Smash, TheGamer, and Raider King identify the bonus ship reward as the Guardian Beast Figurehead. Game Rant calls it the Guardian Prince Figurehead. Since the other three reports agree on Guardian Beast and the chest reward pairing, players should expect the rapier plus a legendary figurehead, but the exact figurehead name is reported differently across sources.
What you get from the chest
Opening the underwater chest awards the Uncrowned Prince Rapier and a figurehead reward. Nintendo Smash says the chest grants the Uncrowned Prince Rapier and Guardian Beast Figurehead. TheGamer reports the same pairing and adds that the figurehead can be equipped at a Harbourmaster or in the Jackdaw's Captain's Quarters.
The rapier itself is a legendary weapon. Nintendo Smash lists its stats as 25 damage, a maximum takedown count of 3, and a perk that recovers some health after breaking an enemy's defense. TheGamer gives the same core evaluation: 25 base attack, a maximum takedown count of 3, and a passive that restores a bit of health when you break an enemy's defense.
Once you have looted the chest, you can equip the weapon through the inventory. TheGamer also notes that players can apply the Uncrowned Prince appearance to a different sword through the Customize option on equipped blades. That cosmetic flexibility matters if you like the look of the rapier but prefer another weapon's behavior or stats for your current build.
Is the Uncrowned Prince Rapier worth chasing?
The short answer is yes, especially if you want a stylish legendary weapon with a sustain perk, but it is not presented by the sources as an outright best-in-slot damage monster. TheGamer's assessment is blunt: the Uncrowned Prince is worth considering because its health recovery after defense breaks can help when fighting many enemies, but its damage is not especially impressive for a legendary sword.
That makes this a weapon for a certain kind of Black Flag rhythm. It favors brawls where you are repeatedly breaking guards and staying in the pocket rather than ending everything on a single burst. Boarding actions, dense melee scraps, and longer fights are where a small health return can change the feel of the exchange. A rapier already carries a different cadence from heavier blades, and this perk gives returning players a reason to lean into pressure, defense breaks, and chained takedowns.
If you are early in a Resynced playthrough and can safely reach Charlotte, the reward is strong enough to justify the detour. If you already have a preferred high-damage setup and rarely get dragged into extended melee, TheGamer's verdict that it is “just okay” outside crowd fights is the fairest expectation to bring with you.
Community Treasure Hunt context for returning players
The Uncrowned Prince Rapier is part of a wider Community Treasure Hunt rather than an isolated loot drop. Raider King lists three community chests: one at 421,939 near Dry Tortuga with 4,000 Reales, the Charlotte chest at 500,167 with the Uncrowned Prince and Guardian Beast Figurehead, and a third near Chinchorro with the Explorer Outfit and Aveline Figurehead. Game Rant similarly reports that players can claim 4,000 Reales, two legendary figureheads, the Uncrowned Prince Rapier, and the Explorer Outfit through the three rewards.
The wrinkle is timing. Game Rant says Ubisoft announced a plan to release a new clue every Friday over a few weeks, but players located all three rewards within days. Raider King makes the same broader point, saying the chest was found before its clue had even arrived. That changes the hunt from a live riddle campaign into a coordinate chase for anyone arriving now.
For returning Black Flag players, that is still a worthwhile little voyage. The Uncrowned Prince Rapier gives you a concrete reason to sail west from Kingston, dive without a marker, and recover a weapon that fits the game's best treasure-hunting mood: quiet water, a hidden glint, and a reward that can reshape the next fight without pretending to solve every fight.