Serranilla is probably one of the most dangerous areas featured in Assassin’s Creed 4: Black Flag, as well as a level 57 Naval Fort protected by 7 defenses.
Nevertheless, Serranilla must be conquered as soon as possible, because the fort includes 4 collectibles, and it allows you to play the last Naval Contract.
Naval Contract 09: The Final Contract, it the contract that becomes available after you conquer Serranilla, but it is also the only contract in the video game that features a special requirement. I
n order to play Naval Contract 09: The Final Contract, you must complete all previous naval contracts, by conquering the corresponding forts. Otherwise, The Final Contract will not be available in Serranilla.
Additionally, by conquering Serranilla you will be able to discover the exact location of the Spanish Legendary Ship La Dama Negra.
The following AC4 game guide explains how to retrieve all collectibles in Serranilla, the Naval Fort.
Assassin’s Creed IV: Black Flag Serranilla Collectibles Guide
Total number of collectibles: 4
Animus Fragments: 2
Uncharted Collectibles: 5 (3 Chests, 1 Animus Fragment, Letter 19: On Being A “Sage”)
Other activities: Naval Contracts (1)
Assassin’s Creed IV: Black Flag Serranilla Chests Locations
In Serranilla, the first chest marked on the map above is located under a damaged roof. After you dock your ship, climb the outer wall to reach the inner courtyard.
Look for the chest near a wall, and inside it you will find 315 Reales.
For the second chest inside the fort you will have to climb the large wall above the first chest. Look for cracks in the wall and continue to ascend until you reach the upper courtyard. The chest is close to several bushes.
You should also spot several stairs and the first fragment, while facing the chest. Inside Chest #2 you will find a jade statue (120 R) and 210 Reales.
Assassin’s Creed IV: Black Flag Serranilla Animus Fragments Locations
Animus Fragment 1
The first Animus Fragment is very close to the second chest, and you will see it the moment you retrieve the money inside the container.
Animus Fragment #1 in Serranilla, is on top of the scaffold, in the small yard outside the War Room. You can climb the scaffold directly, without having to jump from the roof nearby.
Animus Fragment 2
The second Animus Fragment in Serranilla is inside the western tower. Once you destroy the fort and all its defenses, you will be able to enter the eastern tower through one of the holes made by your cannons.
Retrieve the second fragment and start looking for the uncharted collectables in Serranilla.