Marine Fortress is a First Sea island designed for players around Lv. 120-150. Its fortified layout and military theme make it one of the more structured early-game locations, centered around quests and boss progression.

The island has a distinctive crescent shaped design surrounded by stone walls, giving it the appearance of a defensive stronghold. The outer upper section contains grassy terrain, trees, and multiple buildings, while four large guard towers stand at each corner of the fortress.

The inner curve of the island contains a dock leading to a tall central building, where the Vice Admiral is located. Inside this building is a noticeably uneven truss structure, which helps distinguish the area.

A useful hidden feature can be found in the front left corner of the fortress, where a secret entrance leads to an area containing the Black Cape, an accessory available for purchase.

About Greybeard:

• Spawn Time: Every 6 hours (4 hours in a new server)

• Spawn Message: “Loud tremors are being heard across the seas...”

• Defeating Greybeard can upgrade Bisento into Bisento V2

• To get the upgrade, the player must own Bisento and deal at least 10% damage

• Bisento does not need to be equipped for the upgrade to apply

Obtainable Items:

• Black Cape - Purchasable for $50,000 from Parlus, located in the southeast tower.

• Love Letter #3 - Obtained by completing the maze under the castle (entrance is behind the castle and requires an Instinct-breaking move to access).

• Guns Sold by Advanced Weapon Dealer - Cannon, Refined Slingshot, Dual Flintlock.