Would it even notice?  It could wander around all night in that thing and potentially never realize it's contained.  Especially if there are sources of meat inside. 

Seems like a good idea to me. We should do all we can to simulate the natural habitat of these creatures when constructing their enclosures.

I like to think that Mother Winter is just so badass/powerful that despite being just as vulnerable to Iron as any other Faerie, she keeps some in her mouth as a statement. "I use my own personal Kryptonite as Dentures, you want some of this?"

Isn't one of the major dangers to the White Council the possibility that a wizard would be turned and then the Vampire Wizard would be able to open the doors to an outsider?

Nope.

"I thought only mortal magic could call up Outsiders," I said quietly.

Luccio said quietly, "You are correct."

It's what had everyone's cage rattled about it in-story- the Outsider Presence proved the Red's had Human Wizards in the Roster.

Lea might have it, as a keepsake from her time slaying and killing.

Now I'm imagining Lea as one of those bragging parents with a trophy-shelf of all her Kid's Awards:

"This is from the time my 'ickle Godson blew up a Walker with a Gas Station. And this is from the time he burned his Master alive in a duel. This one is from when he burned a mansion full of Vampires to the ground..." 

Very well then: In Skin Game, Harry says that the Knife he takes from the Altar has a Brass hilt:

"And the Brass hilt of the knife clicked against the aluminum splint still on my left arm"

Medea's Bodkin on the other hand?

"I bent to take it up and found an ancient, ancient knife with a simple leaf-blade design, set into a wooden handle and wrapped with cord and leather. It was, I thought, made of bronze."

So unless someone changed the handle, they're different knives.

Why don't you go look beforehand you make this argument... The knife has purpose, if mab truly needed it it was hers.... It's a mortal weapon though, not for mabs usage anyways.

Why don't you provide some evidence that they're the same knife then?

The blade was the same as was used to kill Lloyd slate if you look. Also Woj is it's specifically medea's bodkin, her atheme, not saying that keeps it from being the lance head. I mention it because if it's good vs outsiders might not another Jason's era item show itself on the other side of the equation

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Did Ferro get an Nfected Golden Fleece?

Why would Hades' vault have a Knife that we know Mab has in it? Do you really think that Mab would give up an item of that level of Power?

Oh, I have no doubt that Odin can lie. He's famous for being a trickster and a manipulator. One of his Names is "Oathbreaker".

But Kringle =/= Odin. Kringle is a Fae, and has to obey Fae rules. I also suspect that as Kringle he's vulnerable to Iron, but as Odin he isn't.