The hole turns sideways into a long slimy slide, which spirals around and then lets out into a large room. The temperature and humidity are clearly that of somewhere underground. It looks like a natural cave with the floor smoothed out and the walls carved back in a few places.

She's underground and covered in slime! It's almost comfortingly familiar, at this point.

Harry and Ron slide out of the tube a moment later.

The cave continues around a couple bends, and then a wall of scales looms out of the darkness (or, if you're Samora, is visible the moment she turns the corner). It's a shed snakeskin fifty feet long.

"That's a lot bigger than I thought basilisks could get. You two should stay here. Get a wall at your backs, and if you hear anything coming, close your eyes."

"No. We're coming too."

"What he said."

These kids are so scared and so brave and she has no idea how Potter ended up reading Evil when he's this good.

"I'm fifth circle and have death insurance. You're both very brave but I'm objectively at less risk than you are." And at less risk without them than with them.

"She's my sister. And we're not useless; Harry fought You-Know-Who last year."

"And I wouldn't have caught up to him without Ron."

She doesn't in fact know who, but they're just going to follow her if she doesn't physically prevent them, and at least one of them is strong enough to read an alignment off, and--she doesn't get the sense that whatever history they have has led them to want a heroic death. But if they did, they wouldn't be the first to make that choice, and some who do are glad of it. Still, she hopes that isn't it.

"Alright. But please try to stay out of melee, I'd feel terrible if I let either of you die."

"Don't worry, I would also feel pretty terrible if I died."

That gets a chuckle. Onward goes the impromptu party.

Not far past the snakeskin is a giant pair of doors, carved with a relief of entwined serpents whose eyes are gleaming emeralds.

"Open," hisses Harry, and shoots Samora a glance of guess you needed us after all.

Samora reads that glance loud and clear, and inclines her head in acknowledgement. There may be a trick for using truespeech to say item command words when nobody in the room speaks the language, but if there is Samora doesn't know it.

The next room is a vast rectangular hall. Its walls and ceiling are as smooth as its floor, and two rows of pillars as thick as ancient oaks march down its length. 

Ron and Harry walk with their faces down and their eyes half-shut, seeing just enough of the floor in front of them so as not to trip.

Samora closes her eyes entirely and focuses on her other senses. Detect Evil pans back and forth as she swings her head from side to side, but that's far from the only thing she's thinking about. She's tracking every footfall of herself and her companions, every distant drip of water, every stirring of the stagnant air, the shifting of the light from her glowing shield reflecting from the evenly spaced pillars onto her closed eyelids, and integrating it all into a picture of her surroundings almost as complete as what an ordinary person would be aware of with their eyes open. 

Samora's Wisdom headband cost more money than most Golarionites will see in a lifetime. It is not a luxury. It is a tool of survival.

Nonetheless it's the Detect Evil that first reports something amiss. It's over there, it's about as strong as the cursed item Samora found earlier, and it's breathing but not nearly loudly enough to be the size of the giant snakeskin.

Smart enough to read Evil means smart enough to be more dangerous for it, but stealth would have been a lost cause even if she'd been alone with her shield darkened. She clanks.

"Who are you and what have you done with Ginny Weasley?"

Before the Evil creature can answer, Ron sprints forward, yelling, "Ginny! Ginny are you alright? Can you hear me? Please wake up!" Harry is right behind him.

"She won't wake."

"Tom Riddle? Are you a ghost?"

"I am more than a ghost. I am a memory, preserved in a diary for fifty years. But soon I will be fully human. It's good to see you, Harry Potter. We have much to talk about."