Syreden is a country split in two. During the Erosian invasion, much of the resistance was forced underground, where a combination of skilled tunneling and guerrilla tactics eventually allowed them to win back their country in a successful revolution. As a result, many residents remained below ground, sculpting out massive underground cities. The artwork depicts one of these Eastern Syreden cities.
Syreden is part of the Iron Grip Universe, which you can read more about here: [link]