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.
Another faint impression of a smile. My prison fits me well, singer. Do not trouble yourself.
"Oh, while we're here, can you tell us the name of the Sleeping Man's True Love, the one he's waiting for? It seems like the kind of thing he might like to know. - not her True Name, just, uh, her name name."
"Do true names tend to stay the same forever? Like, presumably the descriptors are not all true at birth."
No, they change over time. But if you know a being's true name, you know their true name.
It is unlikely - an Outsider's true name does not change without truly earthshaking intervention. But yes.
...Mephistopheles is a monster. I know this. But at some time, he may be a useful monster.
And then they're standing in the Sleeping Man's chamber.
Bounce. "Oh, how lovely - a paladin fallen and redeemed, loved by an angel in the depths of Hell! I'm so pleased - it wasn't really set in stone, you know, and I was curious which way it'd fall. Do you want to tell her, or shall I? She's taken over the old quarry office."
And the Sleeping Man blinks the sleep from his eyes.
"I... are you my One True Love?" he asks slightly blearily of the Sensei.
She laughs. "Gods, no, we'd drive each other mad. These nice adventurers are going to take you to her."