Ever since entering the Colosseum of Valor in Planes of Prophecy, I've been seeing an Erudite named Dr. Arcana. He seems to be tasked with public quests and missions. I see him walking around the elemental planes in the Chaos Descending expansion, and apparently he's in charge of missions in Luclin as well. Is there any backstory to him? He must be pretty important if he keeps showing up over the last three expansions.