Ballphin Palaces are naturally spawning Structures introduced in the Shipwrecked DLC. They are found on the Ocean in Coral Reefs, and spawn Bottlenose Ballphins. They can also be crafted using 4 Limestones, 4 Seaweeds and 2 Dorsal Fins, are found in the Structures Tab, and require a Science Machine to prototype. Each Palace houses a single Bottlenose Ballphin, that returns there at Dusk, it respawns after 4 days if killed. As with any other craftable structure, Ballphin Palaces, including naturally occurring ones, can be Hammered to return half of the resources needed to craft it.
- Unlike with Pig Houses, the lights of a Ballphin Palace will not go off when the player gets too close. This allows them to be used as a rather cheap nighttime light source, if the player's boat has enough durability to last a night at sea.
- Bottlenose Ballphins do not react to the player destroying their palace, so these can be a decent source of Limestone if the player cannot find any Coral Reefs.
- Ballphin Palaces were added to the Shipwrecked DLC more than a year after its official completion in the Home Sea Home update, after being tested in a beta branch for several months.