Revolving around the Realm of Earth, the Realm of the Moon is where the night is eternal and change is the only rule. The weather changes from clear to stormy in a few seconds, and then back again, tornadoes and winds appear out of nowhere, and even phenomena such as earthquakes appear and disappear at random. The buildings and mansions are the only constant things in this realm, though their location changes due to security reasons.

Argent Castle

This magnificent building is made of marble and silver. It has five towers named for the phases of the moon, a Hall of the Moon where the Silver Deer Warrior holds her assemblies, a dining hall, a library, a training hall, and the Deer Warrior's bedroom. The castle itself is surrounded by a hedge of thorns that when can put people to sleep by pricking them.

Gardens of the Four Guardians

Behind Argent Castle, there are four gardens, and in each garden, the Four Guardian Beasts slumber. Each of the gardens represents the four seasons, with the appropriate plants grown in them (like the garden with the Black Tortoise having silver holly and pine trees in it). In the centre, there is a sweet osmanthus tree that shades all the four gardens. Lepus can be seen running through the Gardens sometimes.

Fort Buwan

Built by Mayari for the 28 Knights of the Lunar Mansions, this fort is made of Lunar Silver and sandstone, with marble statues. It has living quarters for the Knights, a dining hall, and the main entrance with frescoes depicting the heraldry of the 28 Knights. It has wall towers, defences such as cannons, and a bell tower that rings to signal the arrival of the day.

Maanlicht Woods

Bathed in moonlight, these woods have glowing plants and trees for the adventurer to find the way around. Sweet osmanthus, pine and fir grow there, as well as white flowers of various species, like roses with silver thorns. The fauna there are nocturnal animals such as moon rabbits, wolves, panthers, and deer. There is a Clear Moon pond where the Silver Deer Warrior goes to wash. Were-beasts find shape-shifting easier in there.

Silver Light River

The Claritas River flows beside or around the Realms, and some times, branches flow from it. One river flowing out from the main stem river into Clear Moon Pond of Maanlicht Woods is the Silver Light River, which glows a soft white light. Moonfish, white koi and starfish are found in there, and Moon Vixen of Heart is sometimes found there fishing.