Final Castle
The Final Castle is a large structure that spawns in the Final Plateau. It is mostly comprised of white castle bricks of different variants. Some castle bricks are engraved with different colored runes and covered with force fields.
As of version 2.3.7, the castle is work-in-progress, with no active achievements for the castle. The castle also has work-in-progress monsters, however they do not interact with players. Scattered across the castle are signs, possibly indicating progression for the castle. Due to the lack of lighting, other hostile mobs may spawn too.
Progression
Once the player has traversed the Thornlands, they will come across the Final Castle, where they shall defeat the Final Boss.
Due to its current state, there is no real progression for the castle yet.