Finding Tan'jani

I've been watching you, friend. You handle yourself well out here. Perhaps you'd be interested in helping me locate my brother, Tan'jani.

He was always searching for something--for what I do not know. I received two messages since he left. The first from another traveler, letting me know he'd run into Tan'jani somewhere south of Loch Modan. The second was a bloodstained letter mentioning Riverglades and somewhere called Rog'mar, even further south. The rest was illegible.

Think you can locate him for me?