HotDK 6: "Return to the Camp"
After escaping the Cult of the Dragon's camp you spend several days in Greenest resting and re-equipping including collecting the 250gp bounty promised you by Gov. Nighthill. During that time the town garrison sends out several small scouting parties using the information you provided about the camp's location and approximate population. The scouts begin reporting that the camp seems to have undergone a mass exodus and have spotted large caravans travelling west by north-west toward the Coast Way road.
Leosin Erlanthal, the half-elf monk whom your rescued, approaches you thanking your for saving his life and all you've done in helping Greenest. He also says that he's been studying and following the Cult's movements for some time now, and they're up to something big. In the past they were a fringe group but of late they've started massing gold for some reason.
Based on the scouting party intelligence reports of the camp emptying, he asks that you try again to infiltrate the camp, particularly the cave at the rear as he believes that if any there are any clues to be found that is where they would be.
He will meet you in the town of Elturel where he must travel to inform his friend, the paladin Onthar Frume. Onthar, it turns out, is Pubert's mentor. Leosin offers to cover your expenses and pay you 150gp each to return to the cave.