More about who or what Marganis isn’t is more understood than what is. The name itself is historically connected to the original discovery of Theomancy, and mages more than once in the time since have claimed the name.
Now, a new Marganis has arisen with the same call as the original—restore Theomancy and place divine power directly in the hands of mortals!
The whereabouts of the current Marganis are unknown. His connection to the Order of the Sere Leaf has been determined to be that of employ. Prol Ventin has expressed a particular antipathy towards Marganis.