Thorny Soul of the Eternal Kingdom

Thousands of years ago, the battle of the giant dragon Longo finally came to an end. The four major races unified the eternal continent, and all the people ushered in a new life of peace. People finally began to live a happy and stable life. However, no one discovered that things were not over. Dangerous shadows were still floating in places we could not see, and it became increasingly obvious that they were waiting for the explorers to let them surface...