"I don't! It usually takes about a month to finish a whole one, maybe faster if Path's on a lot of errands."
"Pff. Oh, that's easy to do. Want me to get you lots of pretty magic books every now and then?"
It has two items inside it! A small black pouch, neatly tied, and a simple stone slab with a portal in it. Isabella can see through the portal, but the other side looks to be completely dark.
"You said you wanted one," teases Adarin.
"Oh wow. I'm putting this slab in a box the length of my arm in the basement. I love you, you know that?"
"We should figure out when in the Earth - or possibly the alien planet - calendar to celebrate your birthday."
"Ah, yes. That will require math. It's rapidly becoming either my second-greatest ally or my arch-nemesis. I can't decide which."
"You're first. Though now that I think of it, I'll move math to third, since you mentioned it..."
He laughs. "I'm glad you like it! If the bag's portal breaks let me know, I will fix it."
"Slightly more likely than usual since it's portable, but I put some protections on it. It's a bag rather than another slab so it doesn't break entirely if dropped. Flexibility, and all that, at the cost of potential for tearing."
Isabella nods. "I'm gonna put my alethiometer and thingamajigs and current notebooks and trail mix and stuff in there."
"Probably a spare mirror or two, as well. Just in case. It'll work between planes, too, if you were wondering."