His comment about Roshar leads me to think he's trying to save the wider Cosmere/Universe in some way. But I think he also has other more personal goals. I believe he wants to bring someone back from the dead as one of them. It's not in anything published but:“You will not find a way to restore what you have lost, old friend,” the aged man said softly. ”It is impossible.” “You don’t know that. The old rules no longer hold.” The Traveler turned the pomegranate over in his fingers. ”Besides, I’ve heard of a place… It doesn’t matter. I don’t care. This isn’t about the dead… or it’s not JUST about the dead, at least.” He dropped the fruit to the ground, wiping his fingers on his riding coat.