"There are! Apparently this got you as far as a ceasefire with the Noldor."

"I was demonstrating my capacity to be a good neighbor. Also they were going to destroy half the planet with that thing and that would just have been a shame. King would have done it, too. He has a ruthless streak."

"You sort of bring that out in people. So. Why do I want you as a neighbor, besides your ability to hold ceasefires? You mostly behaved on parole, too, a ceasefire doesn't prove much."

"Oh," he says, "I don't think you do, I think someone will. I've been poking at the paths between dimensions and found one that has a plane for torturing bad people when they die! And I thought 'that sounds perfect' and submitted my qualifications. Good-bye."

What -

She's already touching the Tesseract, come on die -

Tesseract can't find him.

...Sauron?

No Sauron.

Loki's Allspeak proceeds to struggle with a marvelous string of invective.

"What, what happened -"

"They fucking ran away to another world out of network -"

"...how?"

"I don't know! The Valar said somebody named Elspeth 'explained him into' the ceasefire telling him he might want to be a good neighbor to the sort of person who can kill gods and I thought I'd see what he said, it'd be the right time to mention a deadman switch by his own lights, and I didn't - react - fast enough - and he's gone, Tesseract can't find him anymore and I don't know enough about where he went to follow him by teleport -"

"...fuck. Okay. Well. We can still patch this place up, we can chase him when we've got some kind of - scrying or something, or we can do worldleapers from here, once we have another Melkor-killing solution which stretches better."

He buries his head in his hands. "Aaargh."

"Definitely need another Melkor-killing solution," mutters Loki. "We can put all the Fëanors and all the Silmarils in a room and see what they cook up or something. Ugh."

"Did you mention doing something about the dead? We really did have Melkor-killing sorted, albeit with unsatisfactory collateral damage, and I'm sure my father could have done it faster."

"Yeah," sighs Loki, "these seem like more reasonable than usual Valar, even, shouldn't be a big deal."

Back to Taniquetil. The good news is he's gone. The bad news is he escaped before I realized he had a way to do that and he's in a world where my artifact doesn't work.

That is very grave news indeed. I doubt his oaths not to harm people stretch into that world, or that this would suffice if he did, but just in case, the King of the Noldor could claim all neighboring dimensions as Noldorin and their citizens as his. I am not sure to what degree the absurdity of the claim would be a problem.

That would only even theoretically help if Melkor heard about it, right?

Yes. 

Is that likely? Do you have a way to communicate with him? Or can you identify where he went, so he can be more easily followed when I have a more portable way to kill him?

We would need some information to go off. Not much, but some. Someone who'd been to the world in question, or knew someone who had. I suspect he's scrying on Arda if he can because this resolution will entertain him.

I'll suggest absurd citizenship declarations to Maitimo, then. All I know about where he went is that it is not adjacent to my own world and he claimed it had a plane for torturing bad people when they die.

That's not enough for us to work from. I am sorry.