The Ancient Castle, or Sand Castle is a structure found in the Lost Sands. It serves as the dungeon for Chapter 4. It was created by the Roaches and houses the second half of the Ancient Key. It is filled with puzzles, traps, Roach iconography, and Roach constructs.
|Icon||Name and Description||Location|
Reduces a frozen ally's damage taken by half, and gives a chance to freeze the striking enemy upon contact.
|First floor, left wing, behind a crack that must be dug through.|
A rare item sought by collectors around the world. Maybe someone will trade them for rare goodies somewhere!
|Discovery #17 Sand Castle Mural
A depiction of the Everlasting Sapling and the Ancient Artifacts. Its text was too faded to be read.
|Observe the mural on the second floor of the main room.|
|Ancient Castle Key
An old key with crystals infused. Opens a door in the Ancient Castle.
|Big Ancient Key
A really fancy key, which unlocks the Ancient Castle's most fortified room.
|Second floor, right wing, at the end of an ice block sliding puzzle.|
A strange gemstone found in the Ancient Sand Castle. Is it connected to Leif?
|Obtained after defeating The Watcher.|
|Ancient Key (Second Half)
|In the room immediately after The Watcher.|
Main Article: Enemy Formations.
- This area is similar to the Dry Dry Ruins in Paper Mario. Both castles are in a desert-like area, and require a key to be placed in a hole in an empty room to rise them from the underground. They also have very similar parts, such as corridors with direct views into the desert. Additionally, both areas feature a room with several coffins.
- This area was revealed in 2018 October roundup.