"If it's wild, it starts out making small spheres stop existing. About... as large as your head. After a week active, it could disappear this room. After a month, a city block. If someone's controlling it, it depends on how much magic they have." He points at Yvette. "If she got it right now, she wouldn't be able to disappear more than something the size of her fist. Clow could probably disappear a city."

(Yvette goes very still and quiet.)

"How often can this be done?"

"If it's wild it starts out at once per day. After a month, once per minute. That's about the range."

Blair lets out a breath of mild relief.

"Okay. That's not as nightmarish as I'd imagined. Right. What is the best way for Yvette to prepare to go capture some cards, after becoming a cardcaptor?"

Shrug.

Blair grits his teeth and reminds himself very firmly that everyone in the world does not have to be highly competent. They are allowed to not be competent. It means they shouldn't be put in charge of anything, but they are allowed to be incompetent. Even if it is very very annoying.

"Right. So it seems she has two cards, already. How does she take care of them?"

"First she has to become a cardcaptor. She'll need to stand over there," he says, pointing at an emptier spot.

... Blair glances at his sister to see if she's up for this right now.

Yvette takes a deep breath, scrubs at her eyes, and then nods at Blair. She'll be fine.

She steps out of his embrace and goes to stand over there, trying very hard not to glare at the bear thing. It is only moderately successful.

He starts intoning: "Key of the Seal, there is someone wishing for a contract with you." A small glowing dot appears from the lock of the book, and it grows to about one and a half inches before becoming a key.

"Wait, contract? Can I read the contract?"

"...it's not a contract as in a written paper, you're just going to bind your magic power to the Key."

"... Okay? And nothing else besides taking care of the cards is involved with this? My soul doesn't get moved into a fragile rock, I don't become tied to eldritch other worldly Cthulhu monsters, my lifespan doesn't shorten to a year and a half...?"

"...no, nothing like that."

"All right. Then, uh - what do I do?"

"Ahem." He continues intoning. "A girl! Her name is Yvette. Oh, Key, grant her the power. RELEASE!"

The room disappears. She's standing in a void, the only things present being herself, Blair, Cerberus, the Key, and a glowing circle much like the one on the back of the Clow Cards where the "ground" should be. Yvette is at the edge of the circle, and the Key is floating in the middle. A strong wind starts pressing against her as it starts glowing again, almost too bright to look at.

... Yvette still doesn't know what to do. She bites back her anger at this little bear creature's lack of explanation, and does not freak out at the creepy black void.

Should. Should she take the key...?

The Key grows and changes shape, becoming a staff.

"Now, Yvette! Grab it!"

The wind is stronger, coming from the magical floating staff in the middle of the circle, working against Yvette's attempt at doing it.

This is to save the world, she reminds herself, and she fights the wind to grab the staff.

She grabs it, the wind stops, the glowing circle disappears, and they are back. "Done! You are now a Cardcaptor."

Blair does not like how the bear thing is being bright and congratulatory about his little sister being dragged into a life threatening magical contract with the threat of the destruction of the world looming over their heads. He doesn't like it at all.

His expression darkens, but he doesn't snap at the bear thing. They need to be - allies with the bear thing. Do not yell at it. Yet.

"... Okay, how do I take care of cards?" says Yvette, because she is going to save the world and that is important.

"You don't need to do anything for now. You should meditate, sometimes, to keep in touch with them."

He reaches out, and the two cards float towards him and stand up to either side of him. "Windy is the manifestation of the wind. Libra is the manifestation of truth."

"Considering I haven't been in touch with them at all so far, I think now is the perfect time to start," she says, a little tartly. And considering that she is mission oriented, she has a mission now, and she will do it, damn it. "Um. ... Are they - can they hear me, or can I only get in touch with them while meditating...?"