FOG would know that if Galingal is right and she is some sort of fey, that they can have various powers and abilities, not the least of which would be illusion to alter their appearance. 

"The cost need not be counted in treasures, as long as it has value in equal measures."

"Shall ask a price in return for a lead? The price thus paid, my advice you heed?"

Galingal hesitates for a moment. His kind were one fey but that was long ago. But he remembers that doesn't necessarily make them dangerous. Unpredictable was a better description. This one could be toying with them for their own amusement. Likewise it might be amused to help as well.

"Not want lie. Have nothing to offer." Galingal says. "Best keep going. Not waste your time."

"Yes, not lying would be an interesting choice. Would you forgo giving falsehoods voice?"

"But there is no value if you already don't want to lie, a more precious coin from a liar would buy."

"I can offer more than just information, the old one's sight may bring him elation."

"No mere spell, once a deal is struck, but a boon to make your life less suck."

She looks to where FOG is gazing in the direction of her voice.

"I don't think she just wants... stuff... she's talking weird bargains, I bet we could get something good if we word it right!", Jimjar whispers excitedly.

FOG:

"Or we shoot it and hurry it on its way."

Galingal shakes his head at Stena.

"She may be powerful. And has not hurt us," Galingal says. "But I don't think she knows way to surface."

He looks back over to the visitor.

"You ask pay price. No idea what get. I think we just keep going."

She gives a bit of a pout.

"So like a dour shadow elf with no imagination, afraid She will not permit you to rise above your station."

"Scared to ask elsewhere for power, lest you earn Her disapproving glower."

"Do any others have an interest or need? Otherwise on your lost meanderings you may proceed." 

FOG feels a shiver down his spine as the word "hag" enters his mind. He can't recall exactly why, this time around his academic mind mostly failing him. Instead, the memory he recalls is... From much, much earlier in his life. A fairy tale. When he was but a child. The fact he once again recalls the story, and not even the face from the person telling him except the soft womanly sound that came from her, he would consider the greatest affront so far.

Still, he considers it for a moment and trusts his gut that if what he is seeing screams "hag", that is no good news. The hag is never on the good side in the stories, always a trickster. And while accepting a trick is never, ever a good idea... Perhaps it is better than to ignore them, and have them decide that outright attacking will provide more amusement instead. And with that thought in mind, noting how its attention had shifted to him, he slowly gets up. Even if it did seem like the presumed hag might be happy with "good enough" judging how it's saying it'll just move on.

"A boon you propose, and my interest is struck. Yet I must ask, what of my luck?"

"You claim for sight and, funny, I do not yet see, what you would wish to offer to me."

"And then comes the question, what in turn, of my possessions I would adjourn."

He quickly continues from that sentence not making full sense, it makes sense enough. Common is not his native language and he's missing a bunch of memories, okay-

"What do you need, or what do you eat?"

Stena looks at the woman with annoyance.

"Yer just putting words together because they rhyme."

She shifts her annoyance to FOG when he decides to engage the thing.

"Just leave her."

She claps her hands in delight at FOG's rhyming, giving a short laugh, her smile dimming only slightly as Stena's voice comes out of the dark.

"So rhyming annoys the grumpy voice in the dark, perhaps I'll rhyme more, just on a lark."

"To you dear fellow to whom Luck has not been a friend, an offer of assistance down here I will extend."

"A way to see down here with out the light, but in return an aversion to wheree'er it's bright."

"Eyes that pierce the dark most clearly, I think that would aid you most dearly?"

"Or perhaps it's your luck itself you wish to tweak, to have it aid you most unique?"

"But what to charge for such a gift? Some treasured memory perhaps to lift?"

"How much to take the grump's foul mood, and send you on your way renewed?"

"Would you give up your sense of style, to allow her a chance to smile?" 

"To give her the ability to laugh, of your lice I'd ask no more than half."

Stena glowers at the woman but turns to FOG and says, threateningly,

"So help meh if ye make a deal or start rhyming with it again and aye'll snap yer legs."

Not breaking eye contact with FOG she'll say to the KT and Gal,

"Galingal, and whatever yer name is, start poling away from this thing."

"It's Plibbleburp, ma'am. Plibbleburp will go up front so we don't jam--- Aah!" 

He turns in the general direction of Stena with wide eyes.

"Didn't rhyme on purpose, please ma'am don't hurt us! Can't swim with snapped legs, please don't, Plibble begs!"

He jams both fishy hands in his mouth to keep the rhymes from pouring out as Jenny laughs behind the boat.

Galingal swings around at the sound of Pibbleburp speaking. He'd completely forgotten about the KT.

He also caught enough of the rhyme to figure out any gift comes with a very high cost.

'You will be like drow," Galingal says. "See in dark but not in sunlight."

He grabs a pole and starts getting the boat moving.

FOG does think over Galingal words very briefly, to see what he knows of drow psychology and how bad that would be. 

(Just a d20, not sure what check it would be. Full response coming later. At the moment FOG is thinking to take a deal if only to placate the hag, because he believes that a hag that is not entertained is a dangerous entity.)

20

((I'd say probably nature or history))

FOG would be able to recognize that if Galingal is correct, any such drowish modifications to his sight would be problematic if/when they make it back to the surface, but would give him vision while in the Underdark.

((Is FOG aware he's in the Underdark, or does he just think this is a cave somewhere?))

FOG gives Stena a stern look, but it's surprisingly enough clearly not meant to be offensive, as much as that he looked desperate. He clearly felt that he HAD to do this, even if that feeling was perhaps misplaced. That look there for only for a second, before he turned back to the witch, a moment of silence following. Many thoughts and calculations raced through his mind lightning fast at that point, as he considered the "offers" given. 

She obviously wanted him to make a deal on Stena's behalf, that would no doubt go well for her. It was obvious he never considered that one for long, as that was just goading for something bad to happen... Even if it was a bit tempting with how her temperament had been.

No, there were only two options. Presumed issues once he returned to the surface... Not good, but from what little he remembered, most of those memories he was already inside, reading books. Maybe that one wasn't so bad? But for the other one... He didn't really trust the offer of "luck", at least with how it was worded, but when the price was memories...

...Did it matter if it was already something he lost? Would he be okay with embracing that loss forever?

Before things can escalate too much (he's not sure if Plibble is rhyming because of witch magics, or because of him being comic relief), he begins to answer.

"Down in the dark I cannot see, a light a curse that brings woe to me."

"A price it is, a price I will pay, for if I do not escape, I will have no say."

Stena slowly shakes her head at Pibble and is about to gesture a farewell to rhymer when FOG starts talking.

Her knuckles go while on her longbow and she takes a menacing step towards the old man,

"If ye get the rest of us in trouble ye won't live to regret it."

Galingal pauses in the polling of the boat and turns, ready for whatever comes from the old guy’s dealing with the fey creature.

"A deal agreed, and a price thus paid, in the dark you'll be not afraid."
"Any else who have a desire? Any skills you wish to acquire?"

Jimjar looks like he's about to speak up, but looking in the direction that Stena's voice came from last, licks his lips and keeps quiet.

"Thus it is and thus it'll be, Jenny Ragbones will let you see!"

She claps  her hands and glowing orbs of greenish light swirl around her, illuminating the boat, her little mushroom cap boat, and Stena from her hidden position in the shadows. The orbs dart from her, impacting FOG and knocking him to his backside in a flare of bright green light.

When it fades, FOG realizes that his vision is able to penetrate the darkness, he's able to make out his companions, the boat, the water, the cave above and around them.

The mushroom cap floats calmly on the water, with no trace of Jenny Ragbones.

((Darkvision added to FOG's character sheet.))

Galingal looks for a few moments at the FOG. Once he decides there’s no immediate danger he starts polling again.

”Hope not like when Neth say everything okay.”

There's a brief flash of light, a wince of pain from old bones, and surprised glancing about as he slowly gets up, finding his vision, to be fair, much better. Although he doesn't seem too happy about it, really. Gazing about for a moment, a heavy sigh that he apparently had been holding in does escape, before he explains.

"I apologize. I felt... Like this was the best course of action. That was a hag, quite evidently," he said, seeming certain about that fact, although he couldn't quite place why. "And a hag that is not entertained... Is a dangerous hag. The best outcome would be it leaves us alone because it doesn't want to risk anything. More likely, it wouldn't be satisfied with nothing. By taking the deal, at least it's focused only on me."

"...It is the least I could do, after you all saved me."

"...And with this particular deal, it wouldn't want to stop us from getting to the surface," he says, the brief pause suggesting that particular thought came only now, after it all transpired. "She won't get the last laugh if I don't get to see the sun, after all."