Dwarves of Usmor

The Dwarves of Usmor are an ethnicity of dwarves who fled the kingdom of Inshar because they were being killed for their religious beliefs. They worship the golden God who slumbers at the center of the Earth, waiting to be woken by someone. 
This strong belief has shaped their culture to be focused on mining. Usmor is a large island but does not have a lot of land for living due to all the mountains. Despite this, Usmor is a large kingdom and resides primarily underground. The dwarves carve out large networks of tunnels and caverns under the sea and as they continue mining down, they continue to mine out. 
With their continuous mining, they are a highly sought-after ethnicity to trade with due to all the resources they have. They trade ores and stone to nearby kingdoms for crops and livestock. On top of raw ores, the metallurgy work done by the dwarves of Usmor is also greatly loved. 
This makes any dwarf looking to leave the kingdom easily find work if they are somewhat proficient in creating art or tools. Many nobles will hire a dwarf in exchange for them creating whatever the individual desires. Any noble who wishes to flaunt their wealth will commission a large piece from the Usmor kingdom and display it proudly. The Kingdom of Pacellum commissioned all the chandeliers currently hanging in the castle in the capital of Sentalung and it is one of the greatest pride of the kingdom to be able to have such a masterpiece from the Dwarves of Usmor. 
A group who was once banished from their home. Who fled to the seas to escape a tyrant ruler, can now find a home in nearly every country and are now loved for the art they create. As Usmor becomes more and more powerful and known, the kingdom and Inshar become increasingly closer to war with the kingdom to erase its mistake before their wrongdoings are known by the whole world.