Okay.

She puts the bag over her shoulder and goes.

She lands in a beautiful stone room; a floor of polished white marble with an eight-pointed compass rose design inlaid in the centre in veined-pink granite. Curving white stone walls rising in a conical shape, a peak two storeys above her head, lit by a magic light hanging form a silver chain

Laid in the centre of the floor design is an identical copy of the weird metallic cube-sculpture weapon. 

She scoops it up gently and tucks it into the bag.

Nothing bad happens! 

She brings it back whence she came. And alerts her Olórin that she has it.

Does that mean you need me now, then?

We're ready now. If there's anyone you want to mention it to before you go it can wait a bit.

If I mention it to anybody I would worry that they would mention it to Mairon! And then where would we be.

Probably in the same strategic position but only probably! I'll tell Rúmil, at any rate, in case he has to manage the news if someone notices you're gone, but I can do that after I pull you over. Three, two, one. And here is her Olórin and she hugs him tight.

Hug. You look tired. Are you getting enough rest? I bet the darkness throws you off.

I haven't been here in the dark that long but it's been a tiring few days. She rummages in her papers for the notes on the spells he'll need.

He can also confer with the local Olórin on what to expect.

And when he's ready and has the spells understood - it's faster in person than over earcuff - she can drop him off somewhere empty of other Maiar and skip out herself.

If shown the location, Leareth can scry it from a distance, which shouldn't be detectable (it isn't to Velgarth mages) and will alert them if anything goes horribly wrong, not that he's entirely clear on what to do about it. 

She can show him, and is borrowing Olórin's senses to boot.

Olórin summons Mairon to his present location.

Mairon has four eyes and is totally drawing a spell diagram of some kind and is startled and -

MAGIC-SUCKING EXPLOSION!

And then the artifact crumbles to the ground, as does Sauron's body which was not at all the kind that holds together when magic stops working.

"- okay, I'm going to get Olórin back and then I can go see what the fuck he was trying to develop."

Olórin-yoink?

"Bella!" Hug? "That was a lot of excitement."

Hug! "It was, and apparently we interrupted him sneaking around to do something. Is it safe to go to the site of the explosion right away?" she asks the people who will know.

"I do not see why not, there is no magical residue since the artifact sucked in magic rather than releasing it. Probably avoid touching the remains of the weapon itself. I will ask Vanyel just in case he knows anything." 

Vanyel relays that it's fine, they hung out near the last used weapon for a while in the process of organizing the search of Angband. 

She will go and collect the weapon into the magic bag, and Prestidigitate Mairon's diagram in progress clean to take back and examine. And then she will tell Rúmil that everything went fine.