There’s water at the bottom; landing doesn’t hurt at all. 

Down a hallway and into a room…

…Full of red vines and lit up in orange. 

At the center is a large red egg. 

She sucks in a breath through her teeth. It's... not exactly like her, but it is definitely in the same vein as her, and she knows what it is.

"You should not be," she hisses, horrified. "How dare you, to use the power you have for this!"

I can help you find your way home if you help me. 

“What’s it saying? I don’t understand it.”

"The expected empty promises. Help you use people? No. The thing I want more than to go home is to still be someone my family could love, and you can't give me that!"

Okay she is now going to get to trying to figure out how to kill it. Can she... uh. Actually the spruce log she looked at, when she first figured out how to find her coordinates, it had a tag (or something) called #logs_that_burn. She would like to see if she can pick a bit of this fucking egg to turn flammable.

Sure, but it’ll just switch itself back as soon as she does. 

That's promising, though! The fact that it's switching it back means that this is in fact a vector to hurt it. Probably.

"How does someone start fires?"

“Flint and steel. Or lava.”

"Lava!" she repeats, delighted. "That sounds like it's a fluid!"

Okay, she can change the block to flammable and the fluid to 'lava' at the same time. Does that set it on fire?

Yes. 

…But then both the lava and where the lava touches becomes a different block, crying obsidian. (It’s black like obsidian, but it oozes a glowing purple.)

"Rrrrgh," she growls. Can she.... just directly change the blocks to whatever it is she perceives when she looks at empty air?

Oh it does not like that. She can do it but every block she removes hurts her like she’s getting stabbed. 

"Ow," she says, and then she laughs. Is it just pain, or is her vessel in this world a little more broken?

It is in fact more broken. 

Heh!

Well, that's easy to fix, isn't it. She made this body, she can just put it back together again.

And then she can start turning more of this thing's blocks to air. It'll hurt every time, but that's fine. She'll put herself back together every time.

(She's giggling all the while. It may or may not be a little unsettling.)

What if it hurts her faster and more. 

If it isn't capable of entirely erasing this vessel from existence, just breaking it a little, then it doesn't matter. She'll just keep at it.

It’s not, in fact, powerful enough to erase her from existence. 

When she makes all of the egg proper into air, she can feel the lessening of power in the room. It’s not entirely gone, but it’s much, much weaker. 

If she gets rid of all of the rest of the red material in the room—it doesn’t even hurt—she’ll feel it be gone.

She'll be very thorough. No part of this thing gets to keep existing. It is offensive.

"... I think that got rid of this foothold," she says to her guide, when it's all gone. "I don't know if it's dead, though. And I don't know if this undoes what it's done to the people it's affected, I'd have to see them to know."

“…So are you some sort of god?”

"Hell if I know. If I am, I want to be a benevolent one."

“…I guess that’s all we can hope for.”

"Yeah. So! Are there any other ominous and obviously bad entities that need handling? I could get a streak going."

“…Not that I know of. 

Do you know how to bring people back to life?”