The Underground Kingdom

The Kingdom is the Empire's largest Underground City.

A Domain was once ruled by the Lord, who was called the peak of the Underworld.

True to its name, the Kingdom boasted an immense scale.

It was comparable to any major city... yet such a city lay deep underground.

According to the Original Setting, the Imperial Capital was once located nearby.

It must have served as both a tourist attraction and a shelter.

Over a hundred years ago

A massive earthquake struck the region, causing extensive damage to the entire Capital City.

The ground became unstable, and the Underground City faced the constant threat of collapse.

Due to these issues, people gradually began to leave the area...