The Yespest (or Yerpest) were a tribe of Men indigenous to Black Marsh, along with the Horwalli, Kothringi, and Orma. How they arrived in Black Marsh is unknown, but it is possible that they were sent there as refugees or prisoners. Alternatively, they may have settled along the coastal waterways on their own and adapted to the environment. They were known to be active in the region around Blackrose, and they were likely responsible for the stone monuments there, which took inspiration from the architecture of the Barsaebic Ayleids. They no longer inhabit Black Marsh, having disappeared due to unspecified causes.