More than 500 years had passed when the first humans arrived on Dereth. These humans were quickly enslaved by the Olthoi. Many tried to escape, but few survived. One group did, led by Elysa Strathelar and Thorsten Cragstone. They rescued some others and found an Empyrean catacomb, which came to be known as the Underground City. An ancient text in the city told of Asheron and his castle's location. Their leaders left for Asheron, who gave them a poison to kill the Olthoi Queen, which they did at the cost of Cragstone's life. The Olthoi retreated and the humans began to thrive.