Jebediah Omnis was a vengeful Zarosian zealot that revived the legend of The Ripper, a Chthonian majesty, in order to get revenge on Zamorak for defeating his lord. To do so, he hired a group of miners in the guise of a prospector to excavate a new mine underneath the Abbey of St. Elspeth Citharede, where he believed The Ripper was. While the miners found no ore and began to question his intentions, Jebediah easily swayed them to continue working with the promise of better pay.
He eventually found The Ripper's remains and began his fanatical plan by using an illusion spell to cover the mine's entrance, making the miners believe that they were caved-in. He then cast a spell on the remains, allowing The Ripper to search for more hosts. Over the course of several days, the remains latched onto several miners and turned them into ripper demons, including Jebediah himself. The remaining miners who were not infected were killed off by the demons. His last days of humanity in the mine, along with a miners, are recorded in his diary, as well as in a miner's journal.
- His name is a reference to the RuneLabs suggester of the Ripper Demons.