Originally Jocopo were peaceful people, but at some point, they started to wage war, on the Mud People. Jocopo killed men, and stole, raped and slew women. After Chandalen's grandmother were taken by Jocopo, Chandalen's grandfather decided to battle them and contacted the spirits to ask the how to defeat Jocopo. The spirits told him to kill Jocopo in his terms, not on Jocopo's, and trained him each night how to kill them in other way.
Jocopo originally had a larger number of people than the Mud People, but due to secretive attacks during the night by the Mud People, the Jocopo no longer exist.
They had a large treasure aptly named the Jocopo treasure hidden away in a cave. The Sliph had a well in that cave.