Just found this vampire in an article on Bogleech.com. This is a very unique monster among mythological creatures. It seems more like something a creative modern fantasy writer would come up with than a monster locals would invent.

I can totally see this monster as still having a soul and Free Will like White Court vamps (and thus being playable). Another interesting touch is that this could potentially be the only vampire that you can turn yourself into without the original vampires consent (just plop the bird into your mouth once you get the original vampire to vomit it out).

Hmm. So, Item of Power (the Black Chick) [+1] granting Feeding Dependency [+1], Human Form [+2], Blood Drinker [-1], Claws [-1] (the tongue), Wings [-1], and Inhuman Strength/Speed/Toughness/Recovery to taste.

No.  Assuming you've managed to research, acquire ingredients, prepare, and cast the spell* prior to invoking aspects, it might...though duration needs corrected / clarified.  I'm not sure where your duration of 'noon' came from - dusk and dawn are the thresholds.

Changes, when Lea makes a some magical outfits for Susan and Harry, and when Harry makes a snark about hoping they won't disappear at midnight, she responds with something to the effect of "Of course not; what do you take me for, a Summer faerie? They'll last until noon." This implies that Seelie/Unseelie magic lasts until midnight and noon, respectively, rather than until dusk/dawn like most thaumaturgy does.

It's also explicitly stated that you can only buy temporary powers for one scene.  (YS92)

Yeah, but I figured you could keep buying the same Temporary powers over and over again each scene. It adds up quick, if you're trying for anything more than a power worth more than one or two Refresh.

*The spell itself isn't going to be easy.  You'll need the appropriate symbolic links to start with...good luck getting away from a dragon with anything useable as a symbolic link back to him.  Harry went through some fairly extreme measures to get a link back, what do you think the dragon might be willing to do?

The symbolic link is himself; the dragon he turns into is a manifestation/personification of the predatory and possessive instincts that come with the Mantle of the Winter Knight.

EDIT:

Hmmmm. Well, first off, a necklace is only a +1 Item of Power, you'd need a dragonskin cloak or something to be +2,

*checks Item of Power* Hmm, I think you might be right. It's based on whether or not it's concealable, though, not size, so a ring should work. You can't conceal them when you're wearing them openly on your finger, after all. A pin for his suit-collar or tie might also work. Or belts, if he wants to just rip off the Hexenwulf spells.

speaking of which...none of the Tags you list actually explain how he casts the spell. The story of the spell, y'know, what the whole process of making spell declarations is supposed to be about?

Hmm? He sits down, and does a bunch of calculations working out the physical principles of the thing. Then he builds the image in his mind, whips up a circle of ice with Evocation, and pulls on the power of Winter through his Mantle to power the ritual, and the instincts of his mantle to understand how to use his new form, and focuses them through the mental images he has and ties them all off in the item he's using to store the spell.

So no, I wouldn't allow that. Or any spell that was designed that way. On the other hand, getting your hands on the scale of a Dragon (Contacts), finding the proper ritual in an ancient book to assume a tiny fragment of it's glory (Lore), and a single Scholarship Declaration (any one of your three) to understand how to structure it properly, and I might allow it, yeah. Spells must be thematically appropriate in order to work. Indeed, with Thaumaturgy, that and time are their only real limitations, so you damn well better enforce them.

It's not an actual Dragon, so much as the image of a lower-case dragon as a representation of the possessive and predatory aspects of Winter.

I'd also just generally be very skeptical of applying Item of Power or Human Form to any temporary power set. Their disadvantages are mostly long-term, and I'm very skeptical of allowing them on such a temporary thing. But that's a personal thing not the rules. I'd also be very skeptical of any PC grabbing Beast Change on a temporary basis without some sort of possession going on (ala Hexenwulfen, and likely including Demonic Copilot), simply because it's really hard to justify any other way.

Becoming a personification of the worst of the Winter Knight's instincts wouldn't be enough for you?

So, in short, yes, you can do what you're talking about (at the costs in question), but the item needs to be more obvious and you need better thematics for your Thaumaturgy to actually work. And you need an explanation for Beast Change, which you are seriously lacking.

He gets big and strong (increasing Might), and overwhelmed by the instincts of his Mantle (decreasing Scholarship and increasing Fists, Survival, and Stealth), dulling his thought processes. Also, he doesn't have hands anymore, dropping Craftsmanship, Driving, and Weapons to 0.

So, let me give you an example of what I meant, using a character I've written up but not played. He wants to turn himself into a were-dragon, enchanting a necklace to give him the power to transform. Mechanically, this is Item of Power [+2], Beast Form [-1], Echoes of the Beast [-1], and Human Form [+1] affecting Wings [-1] and Claws [-1], for a total Refresh cost of [-1]. He's already got Unseelie Magic to use for the breath weapon, and Inhuman Strength/Toughness, so he doesn't include either of those in the ritual.

So, setting up the ritual, he Invokes his High Concept (Nerdy Winter Knight) for the raw power to power the ritual, and his Trouble (Mantle of a Monster) to give him the predatory instincts to use his new form properly. He then uses his Scholarship to make three Declarations: I Have A Degree In Aviation Technology, to work out how to get the thing flying properly; The Mind Of An Engineer, to reflect his past training with mechanical engineering to work out back-of-the-envelope calculations on how the basic mechanics of how its limbs and whatnot would work; and I've Read A Lot Of Wikipedia, for the biological knowledge to make sure it wouldn't just keel over and die on him.

This is a total of five Aspects invoked/tagged, for a total of five Fate Point-equivalents; so the enchantment on the necklace would last for five scenes or the next noon, whichever came first, right?

This is immune to Ebenezar McCoy. The Blackstaff. A guy who can destroy cities or small nations when he feels like it.

(click to show/hide)

Who is seeking vengeance for the death of his daughter.

When he has years to prep. That's clearly immunity, not resistance.

And yet, he never even thinks Outsider. That clearly indicates it's not an 'Outsider only' thing in his head, and who'd know better than him? Okay, the Gatekeeper, but who else?

Huh? Talos showed up in Summer Knight, and Eb only showed up briefly in the very beginning of that one, when Harry went to visit the White Council.

You don't even need the pre-established sponsor to be able to do this.

*checks*
Huh, you're right. I suppose my next question is, if you perform a thaumaturgy ritual to grant yourself extra powers, do the Fate points/points of sponsor Debt you spend on Aspects to power the thaumaturgy count towards the cost of acquiring those powers? After all, it's entirely possible for non-spellcasters to spontaneously acquire powers just by spending Fate Points, with a decent justification (like changelings sliding more towards their faerie side).

Huh?  Ogres are immune to magic.  They're just Nevernever creatures.  I'm not sure Lawbreaker is appropriate - especially considering Lawbreaker only applies to spellcasting and not natural abilities.

He might just be an Ogre changeling, but I could see the possibility of a human having some kind of latent magic-grounding properties, depending on his background.

If you're referring to the "ogre" in Summer Knight, it wasn't immune to magic. It was just highly resistant, because it was actually a Sidhe Lord using a Glamour to look like an ogre. I'm not actually sure if Harry's ever fought a real ogre before, and not even the Faerie Queens are fully immune to magic like Outsiders are.

Of course, Raz does escape through the Nevernever and eventually manages to clear his name.

But even if he cleared his name of the original charges, wouldn't he be guilty of escaping prison do so?

What's a shonokin? Is it something non-canonical that you've homebrewed?

If the cops seriously think they've killed a cop, though, they PCs are going to have hell to pay. Cops do not like it when people kill cops, and they will stop at nothing to bring them to justice. You can expect any underworld contacts the PCs have to desert them as well, since they'd be well aware of that. Noone wants to deal with a cop-killer, lest some of that heat fall on them as well.