There is something on Lian Yu that holds magical properties, which is what Baron Reiter is really after. And, as Oliver states, he's not the first person to come to the island. So what is it about the place? It's hardly a hotspot for tourism, but something keeps drawing people towards it, and now we know for definite that there is an object of some description with powers there, so presumably that's the link. What exactly is this mystical object (or place) that Reiter is after?