Coming back rested with a new direction, he sets about looking for any mention of a myth about a piece of Selune falling to Toril during a battle with Shar, what that could actually be, and where it might have ended up throughout history until the present.
On a second but related note, he goes about trying to track down information about something that was stolen from the Skettus Vaults by Menner, a shadowy orb of some kind perhaps.