Easy enough. They should get some people confident that their alts won't mind forking to man Bar and keep an eye on maybe a few dozen Ardas apiece.

He knows some people he can ask.

"I wish we had a way to deal with ones who are already loose. A black hole could obviously do it, just the collateral damage..."

"Yeah. Black hole and a team of a hundred thousand fairies to evacuate everyone?"

"They'd have to find them. Flat Valar can manipulate gravity but I don't know that a black hole would work if they did enough of it to save the planet."

"Has Timothy tried his murder spell?"

"On whom? No."

"Are there not any suicidal Maiar? You'd think there'd be at least one."

"I'd expect one of you to be the person to ask!"

"I do not know a single suicidal Maia! Maybe Timothy can try to kill one of the oathed-harmless ones in Singularity? Maybe he can teach Cam the spell, since Cam is indestructible and Timothy is very squishy."

"They have a self defense clause, won't hold still for it..."

"We have invisibility, they wouldn't have to see it coming."

"Unless they use other senses. But I can suggest to Cam that he learn the spell."

"What would the collateral damage look like on the smallest possible black hole -"

"I think it still eats the planet, unchecked - maybe a fairy could move it and only rip up half the continent with tidal forces -"

"Maybe in Space Ardas where he's been paroled we can lie in wait and hole him when he leaves Valinor for Endorë."

"That'd work if we timed it right and knew where to intercept."

"All this magic, we've got to have some way to track him."

"We can tell where he's been, probably, but catching him five days later might be another matter."

"We can conjure for the ship, if not for him directly."

"I'm a little worried that his exact route might be sufficiently path-dependent that we can't find him by looking for where his alts have gone when they made the trip, if we're going to lie in wait."

"Maybe if we changed a lot of stuff prior to that, but do you think it'd vary if we've done nothing but sneak in to wait for him?"

"Depends how he picks it. It's a long trip."

"Maybe we could nip him on the way out, it's probably far enough from the planet that a small black hole wouldn't rip it up."

"Or surround it with those magnetic shields that Cam has in his planetoid."