It's in chaos. There's an enormous monster rampaging through the streets, taller than any of the buildings, and the streets are packed with screaming and stampeding people. The ground is slick with blood and vomit and monster drool. 

Well, that's how nightmares are. She has a sword, and some limited armor over her dress, and she's good at stabbing monsters. Admittedly this is a real big monster, but the bigger they are, the harder they fall, or something.

First of all she looks around for someone doing something other than stampeding with the rest of the dream people.

There are some flying people shooting spells at the monster; they bounce off its hide.

Any of the flying people look like someone she knows?

Nope.

Weird.

She locates the monster's nearest leg and attempts to stab it, very very deeply, with her sword.

This works but it regenerates as soon as the sword is out.

Hmm, inconvenient. 

What did she do the last time she was in the Fade? Went around copying different forms and getting a different vantage point, going around or through obstacles she otherwise couldn't. Shape-changing, like Morrigan does, like she's teaching Draconis to do. In the Fade everyone is magical, sort of, you just have to - focus -

She focuses on becoming one of the flying people.

The flying people are all pointlessly bouncing spells off the thing's hide.

Yeah, but she doesn't need to kill it, necessarily, she needs to figure out whose nightmare this is and whether she can leave with them.

If she can get herself to be one of the flying people then she'll look down, at the ground, for - anything else that looks unusual, really, anyone not following the crowd -

Most of the crowd is indistinct, a sea of movement, there's kind of only one bit where it's actually fully-realized people.

Oooh, and if she flies over there?

No one doing anything different from the rest of them. Just fleeing.

Huh. Can she... see faces, in the area where people have faces?

Yeah. Strangers strangers strangers that one's Mahdi. Fleeing.

"Mahdi!"

He turns around, confused. The monster snarls.

She swoops down and lands beside him. "What is that thing?"

"Tarrasque. Thing that didn't eat Hagan's family. I guess maybe now it did."

"It's not real, you're dreaming. - sort of. I think if we die we may actually die. But we can leave, into someone else's dream, if I can - find my way back to mine, somewhere around here - "

"How can you fly?"

"Uh, it's a thing. Everybody's sort of magic in the Fade? And if you focus really hard you can take the forms of things you find in the Fade, sometimes - it takes practice and it might be easier for me for, uh, reasons, but I've been stuck here conscious for days before, so - "

Her face lights up.

"You know what would be really cool."

"No," he says. The Tarrasque stamps some city as it tears its way towards them.

"Run. Vaguely that way, my dream was over there. I'll catch up in a second."

She focuses.

Can she turn into another Tarrasque. If the thing gets too close before she manages it she will follow Mahdi out, but she's not completely sure they can outrun it, and it would be so cool, and plausibly even a useful form to have in someone else's dream at some point - plausibly this is motivated reasoning - she stares up at the thing and tries to memorize its shape, tries to picture herself becoming it - 

Now there are two Tarrasques stomping on the people of Sothis.