Vinheim is Mithos Yggdrasill’s castle, located in the depths of Derris-Kharlan. The interior of the castle contains two spiraling staircases, a balcony, throne room, lounge, library, and rooftop connecting bridge.
Welgaia, the Holy City, is a city on Derris-Kharlan. It is populated entirely by angels, and is the main base of Cruxis. The only way to enter the city is through the Tower of Salvation. It is filled with high technology and computers that serve as archives.
Derris-Kharlan is a giant comet made up mostly of mana and is said to once have been the home of the elves before arriving at the world of humans, where the elves moved, living together with the humans. It is now the home of Cruxis.