Belmarniss can now sorta muddle along in the local common thanks to aggressive use of comprehend languages to hand-translate books after roping a local into teaching her the alphabet. Also she hates teleport traps with every fiber of her being. Also she has figured out at this point that she somehow leveled in sorcerer instead of wizard during the business with the pirates and has no idea why that happened or whether it will happen again. And she has sold this stupid arrowhead to two different curio shops and given up as it seems to be cursed. And she just needs to keep doing what she does, she guesses, till she can teleport herself home. The Yawning Portal is a nicely ironic name.
"As do I!"
Jojo's nose twitches abruptly. "-I think we're getting close. I see... something... off in the distance. Something glowing."
They approach cautiously. The glow turns out to be a portal, a pool of shimmering light in the ground.
"The path ends here," Jojo says. "Goes straight into it."
Jojo hops through first, followed by the others. They come out in... a place. Somewhere. Everywhere? It's a kaleidoscope of landscapes, locations, interior and exterior. For a moment it's Belmarniss' childhood home, then it melts into a high-ceilinged temple, then an icy cavern, then a sweltering jungle.
The only constant feature, other than the four of them, is a creature floating in the center of each space. Her eyes are empty white, and while her face is beautiful, her body is a fluttering mass of wings - butterfly wings, bird wings, bat wings. She turns, disturbing the currents of the air through the (monastery) (desert) (glade) (mountaintop), and stares at them blindly.
"Angel?" she croaks to Jojo. "Why do you travel with this one?"
"Which?" he asks.
"The invader. The self-imposed Lord of the Eighth. Mephistopheles."
"...I'm not the angel, and that's not Mephistopheles. I just have the angel's ring. And, um, she has a piece of the archdevil lodged in her heart."
"For legal reasons I have assumed his place in the cosmos against my will but I am a different person."
"...I see... it's awfully confusing. I ask where Mephistopheles is and he is before me, but I sense your aura, your heart, and it is pure... and you, ring-wearer, I know the angel lies in the City of Lost Souls, but you wear his ring and you are so like him... well. What are your questions?"
"I need to find your sister, the Knower of Names."
"My sister, you call her? I suppose it is not wrong..."
Suddenly, they all know where the Knower of Names is. The same way Belmarniss knows her prepared spells. She's deep in the wastes of Cania, past a terrible battlefield of the Blood War.
"Your ring will show you the way as well, should you need to go on foot. Who next?"
The Knower's brow furrows. "...you will go far, farther than you think. I see the edges of the shape of your story in this travelogue. To Waterdeep, to Thay, to Rashemen, back to Thay... to the great unformed sea beyond all things, where gods die... to the Wall... and from there, somewhere even I have not known, but that you call home."
"I distinctly saw my mom's old cave in your display here, why can't you see Golarion?"
"My realm is given shape by those within it. You see where you have been, and where your companions have been - the places that made them who they are."
Somewhat demonstratively, they're standing in the tavern where Belmarniss met Hagan.
"Huh. Waterdeep, Thay, Rashemen, Thay, great unformed sea... Wall, I was trying to avoid that... then home. O...kay." She writes this down.
The Knower smiles. They're standing under an impressively large tree in the middle of a burning city. (Jojo winces.)
Deekin raises his hand. "Deekin next?"
She turns to him, and they're in a modest house, decorated eclectically. "What is your question, Deekin?"
"Deekin want to know... where Deekin find Mischa Waymeet and Tynan Blake."
"Mischa is in Heaven. Tynan lives in Neverwinter, wandering the streets of the Beggar's Nest."
Deekin hisses as if in pain, then nods. "Thank you."
"My turn?" Garrus asks.
"Certainly," the Knower says.
"Where can I find my true love?"
The Knower hums thoughtfully. "...You will find true love if you return to Zhentil Keep. And while this verges on 'who', the woman I see standing beside you is a halfling who wears a purple headscarf."
"...a halfling?"
"Yes, a halfling."
"I was... expecting another reptile."
"And you get a halfling. You're welcome, by the way, for saving you rather a lot of trouble."
She shrugs. "There are names written into the stars. Some have many; some, only one. Occasionally someone will have none at all. The reptile could be happy with many women. The halfling is a true love, and one who will not lead him into disaster."
She shrugs. "It is my home. The devils came later, and none can find me without my allowing them to do so, and so they do not bother me. Besides, I am everywhere and nowhere."
"I have never known anything else. But - when you go, I will watch the flowers bloom in an oasis amidst the Anauroch Desert. I will watch the war in the streets of Menzoberranzan as they reel from the loss of their Valsharess. I will watch a mother in Neverwinter grieve the loss of her only son. I am everywhere. But I cannot pluck a flower to put in my hair. I cannot strike a woman down in the streets of Menzoberranzan. I cannot comfort the mother in Neverwinter. I am nowhere."