Well as far as we know, the root cause is Corypheus, and the elven orb he carries ... if we could figure out more about that, perhaps we would have a better idea how to close them.

[He can't see her, but she makes a thoughtful noise to let him know that she has her pensive expression on.] I hope we can too - especially since opening the Rifts now just sends them into the Fade.

[And nowhere near home.]