Peptis

In brightest day, in blackest night, all evil shall come from my sight. Let all those who praise The Shepherd, beware my power, Dark Green Lantern's light! In the far future of the Original Universe, Peptis was a soldier of F-Klak's army who was promoted to the status of Dark Green Lantern.

A Dark Vision
In 150,080 CMT, D-Klak had a vision of Peptis, Agga, and Memnon that was induced by close proximity to the Keruvim. At the time, he was aboard the Ironclad, which was in the atmosphere of Vizima. He stated their names, but did not seem to do it of his own free will, indicating that he had little control over this vision. Other than the names of F-Klak's soldiers, it is unknown what else this vision revealed to him, if anything.

Far Future
In the far future, in an unspecified point of the universe, F-Klak and Striborg gathered Peptis, Agga, and Memnon, three of F-Klak's best soldiers. F-Klak told the three soldiers that, due to their loyalty to him, each of them would be made a Dark Lantern and could choose which of the Dark Lantern Corps to join. When it was Peptis's turn to speak, he/she recited the Dark Green Lantern oath, so F-Klak enrolled him/her in the Dark Green Lantern Corps.