Jatil Jivelg (whose name means Cruel Tormentor in Draconic) was a Black Dragon native to Kiston who had massive ambitions. He was encountered by both parties of the It Came From Kiston campaign. The ancestors of the campaign encountered him as a young black dragon, while the descendants met him nearly two thousand years later, as a massive black wyrm.
In the late 1290s PR, Jatil was one of the strongest and most terrifying of the dragons still on Kiston, an adult red dragon named Presidith admitted that most dragons worked or served Jatil in some capacity.