And they're somewhere else. She's in the mountains, among the ruins of some grand structure. It's nighttime, the only light comes from a few burning torches, and a... glowing ball on the back of some titanic figure towering far on the horizon. 

There's a few statues that are uncannily detailed, in a way petrified people usually are, though they are too angular to be huamns.

A teleport trap? This is nowhere she recognizes.

They both crouch and freeze instinctively. Do the torches feel and smell like ordinary fire or do they show up to Detect Magic? Is anything else here magical? What creatures can they hear or smell? (It will take their eyes a few rounds to adjust to the sudden darkness.) Is the titanic figure moving?

What do the stars indicate? Aria hasn't seen the constellations in the very distant north or south of Golarion, but almost every night sky should have a part that's familiar to her. (Also, this isn't a freezing wasteland or an ocean.)

The titanic figure doesn't move, and the ball shines with steady light. Torches are magical, the statues are magical, some of the architecture is faintly magical. If their sense of smell is good enough, they can probably tell that some people passed through here and into the ruins not very long ago. Also various birds, animals and so on, not a lot, but plausible for the mountains.

The stars are entirely unfamiliar. 

That... really shouldn't be the case? She doesn't have much experience with teleport traps but shouldn't they be limited to a teleport's range?

She didn't recognize the magic on the mirror, but that doesn't mean much. Could it have been a plane shift trap? She hopes not, it would make it very annoying to get back home and she doesn't want to spend time on any other planes, not even the nice ones.

The statues being magical means they're not stoned people, or not just that. None of this is a great sign, magical ruins are never safe. Best to leave and find a more normal bit of mountain.

She tells Tora about the magic she can see, steering them around it. Can they get away from the ruins and sundry magical effects?

There's some roads, though it's hard to say where they lead. The mountains are tiled with lesser ruins pretty extensively, though they seem to be near the biggest structures right now. 

No, see, they're not humans, they want to get away from all the roads. If the whole mountain is full of abandoned and ruined buildings they'll settle for a place that's not magical within a few hundred feet, if there is one.

They can probably try to find some, though before they get far, a large door to the ruins opens, seeming moving on its own, and a red-haired girl comes out. 

"Hello! Are you lost? You seem lost. We're Tribbie!"

Aria doesn't recognize the language but her permanent Tongues takes care of it.

Someone being here - might be a coincidence. Their arrival might have made noise they didn't hear themselves, or there might be a lookout they haven't spotted. The structures around here seem ruined but whatever's inside those doors might be perfectly livable. But it might also be something more than that.

"I'm Aria, and this is Tora. I'm not sure how lost we are, can you tell us where we are?"

How magical does Tribbie look?

Quite magical, with multiple overlapping auras. She also has tiny metal wings flapping behind her back, floating. 

"This is the Abyss of Fate! Or Janusopolis. Where're you from?"

Not human, not any kind of humanoid Aria met before. This is almost certainly not the Abyss but the name does not inspire confidence.

"The Verduran Forest, in eastern Avistan, near the human nation of Taldor. On the planet Golarion, on the Material Plane. What plane or planet is this?"

"Wow, we've never heard about any of those! This is the world of Amphoreus! We're not sure what you mean by 'plane'..."

"Will you come with us? We're here to rescue some priests and bring them to Okhema, the holy city of Kephale. The Abyss isn't safe."

"Not safe in what ways?"

"The Strife Titan's minions -" she points at the statues "- they're still right now, but they might wake up anytime."

"And they would attack strangers? What wakes them up, and what are their powers? How far would we have to go to get away from them?"

"Nikador has gone mad long ago, and their titankin attack everyone. There ones won't go far from here, but most places aren't safe either. That's why we're trying to get everyone to Okhema!"

"I'm afraid I don't recognize those names or terms. You asked what a plane is; it's - one of the areas the universe consists of? The nine afterlives are planes, the four Elemental Planes, and the Material Plane with mortal people and suns and planets and so on. You need the Plane Shift spell to go between planes, it's fifth circle for clerics. If you don't know what plane this is, I assume it's the Material - it doesn't feel unnatural and the others probably all do, though I haven't been myself."

"What are Titans? Is Kephale a god, and what's Their alignment?"

"The Titans are gods! It might be a bit tedious explanation if you're from so far away... Kephale is Worldbearer Titan -" she points to the figure holding the glowing ball "- they created life, and now, they hold the last light in Amphoreus." 

If they're really on another plane, and not an immediately recognizable one, then it's very important to learn about the locally active gods. Aria isn't going to trust a random stranger's word, especially one who approached her, but she will at least hear her out.

"That doesn't sound like our world," she agrees. "Can you tell us more about Kephale? What are their domains... the things they're concerned with and promote? Do they have many clerics or other empowered worshippers, are they the ones making Okhema safe?" Buying a plane shift from a cleric sounds like their surest way home.

"They used to talk to humans a lot! But a thousand years ago, they fell silent, after issuing their last prophecy. Now, they carry the Dawn Device, making Okhema the last place to have daylight, after Aquila went mad."

"We should at least go back into the temple! Snowy will be worried for us."

She signals Tora to be alert. "I mean no offense, but as complete strangers here it would be unwise for us to enter the magically-defended temple of an unfamiliar god. We know almost nothing about Kephale yet. Are you a cleric of theirs?" 

'Tribbie' has consistently ignored all questions about her god's alignment, domains and interests. That might mean she isn't confident in her ability to lie, but Aria cannot in fact read the face of an unfamiliar humanoid race from another plane.

"We aren't Kephale's priest! We were once the Holy Maiden of Janus, Titan of Passages, and now we hold their coreflame... Right, we haven't explained this yet. We were once better at telling this in a sensible order, sorry..."

"I'm afraid I'm unfamiliar with coreflames." It sounds like yet another word for a god empowering a mortal.

"Right. Kephale's last prophecy said that the children of humanity with golden blood in their veins shall slay the maddened Titans and pluck their coreflames, becoming demigods and inhereting their divine authority. Once all twelve coreflames are restored, a Miracle of Genesis will occur, and restore this broken world."

"We didn't actually have to slay Janus. They knew their madness was approaching, and passed their coreflame to us. Since then, we have travelled all of Amphoreus spreading the prophecy."

...right, this plane will have functional prophecy. Another reason to step extremely carefully. If they bring the shadow of broken prophecy with them, any gods who notice them are likely to be very displeased. Best to have as little effect on this plane as possible, and leave it as soon as they can. She already intended to do that, but now she has a tighter deadline.

The story about coreflames (divine powers? divine authority, domains, maybe followers?) being passed around, or stolen, by mythic human (?) adventurers doesn't make inclined to be any more involved in any of this.

But, regrettably, they can't leave under her own power, they need friends or allies or at least trade partners, and the girl in front of her just claimed to be a demigod. Or a mortal with power on par with a demigod, anyway.

"All we want is to go back Golarion, without harming anyone here. Is there something we can do for you in return for sending us home? I am a druid of some power." Whatever the ostensible demigod's domains, she must be able to cast plane shift, by making a cleric to do it for her if nothing else.

"Also, I would like to include Tora in the conversation. She does not have Tongues like I do, but I can enable her to talk if you will speak our language, or share the language with you."