The Abysmal Depths

Made up of millions of known caves, caverns, mines, buildings, cities, and other underground areas, the Abysmal Depths are an unofficial World unto itself located beneath Magrön's surface, and remain mostly undiscovered and unexplored.

The Southern Misanthropy
Officially dubbed "The Great Misanthropy of the Southern Depths" by the Trivlegian governments, it is an area in the Abysmal Depths located a few thousand kilometers southeast of Lagrën, where the makeup of the underground changes drastically and becomes extremely hostile to foreign life.

It acts as a barrier preventing further exploration in the direction of it's center, as any attempts to do so are rendered failures by the Misanthropy's bizarre caves, creatures, and material makeup, which quickly becomes organic and hostile the further in one goes.

The shape of the Misanthropy's border has been observed as spherical, and indicating a width half as big as Lagrën itself.

The Trivlegian system
The Trivlegian system is the collective name for the three underground cities of Velgolar, Dersunžan, and Kirćys, each of which is located beneath one Magrön' continents, and are connected with the current fastest known public transportation network on magrön, but can only be accessed and used for an extravagant fee.