To end the cycle that's going to end up with us all in the earth. Free everyone who's been taken, and let the Old Man finally die the way he wants to. Unfortunately, that means going directly against King and any Judge loyal to him, and ultimately, probably killing them. I'm hoping some can be transplanted to other worlds; there are a few benevolent ones.
That's the scope of what he's asking Delphinus to help him with, and what some people on Delphinus are sending out feelers for. It's big -- but after what just happened, I'm starting to think it's the only way we can get everyone out of here intact.