[X] Shout at her that Quelana wants to know what happened to Quelaan. If she stops fighting for some reason, hear her out. If not...
-[X] Kill her. Try taking off more of her legs on the side already missing one. Keep her attention on yourself as much as you can. If she goes for Oscar, get in her face. Or the spider's face. Putting a claw through that would probably really slow her down.
"Wait! It's Quelana who wanted to know about her!"
Quelaag tosses the super-hot fireball with a flick of her hand, and it's sent hurtling towards you. You dodge to the side and it flies past, hitting the ground behind. It explodes on impact and leaves a small pool of lava in its wake. You take a careful step away from the pool and look back to Quelaag.
The spider woman has straightened her back and is looking down at you with contempt. Even so, she doesn't follow up her attack.
"Who are you?" She growls, baring her teeth. At least she's willing to talk now.
"Travellers, I guess you could say. Adventurers?" You glance around her large body to check up on Oscar and find him stumbling to his feet. You shrug as you return your attention to Quelaag. "I've learned a bit of pyromancy from Quelana though, so she asked us to ask about Quelaan for her."
She scoffs and goes to fold her arms, realising with a twitch that she's down a limb. "Then that pompous fool is still alive, after all." She takes a few steps forward to loom over you and leans down, her lips twisted into a scowl. "And what does she want with our dear sister?"
"Uh…" You scratch your head at the question. You probably should've asked for more specifics. "Something about your kingdom collapsing. I guess she just wanted to know how she's doing."
Quelaag turns her nose up at this and her spider's tongue flicks out at the air, coming close enough to feel the heat radiating off it. "I am not as unaware of things as she might think." She says, stepping back. "The mortals of the town above bear many of our gifts. Those children who have reached full maturity have told me of the cloaked figure outside."
You frown. "If you knew she was out there, why haven't you talked to her yet?"
"None of the children ventured close enough to confirm whether she was living or a corpse." She begins circling around you, her spider's tongue tasting the air and leaving a wake of shimmering heat. "Besides, I have nothing to say to that woman. She abandoned us in our moment of tragedy, and has cowered out there for far too long."
She clicks her human tongue and stops behind you. "Though, I suppose I should pay her a visit after all, if she plans to send assassins into my lair."
"We're not-"
"Kirika, look out!"
You turn in time to see Quelaag bring down a wave of raging fire towards you. Without thinking, you duck to the side and swing a claw up to catch her attacking arm. Your claw cuts into it at the elbow and it cleaves through flesh and bone with little trouble. Your other hand moves to thrust a claw into the spider, plunging in through the mess of eyes almost to your hand.
Quelaag screams in pain and her spider legs give out. Her human body collapses onto her spider, her blood boiling on the creature-half's hot skin.
"D-Damn you, filth!" She hisses through clenched teeth. "May Mother's flames consume you!"
Her human and spider bodies both begin to glow with a burning energy. The cracks and wounds in their bodies drip with molten fire, and you feel an intense heat radiate off of her. Thinking quickly, you slow her time as much as possible and leap away.
She explodes in a violent blast that sprays molten fire across the chamber. You make it out of the splash radius thanks to your slowing magic, and stare at the charred remains of the spider woman from the edge of a burning pool.
She… killed herself?
*Chaos Witch Quelaag defeated*
"One less monster in the world." Oscar murmurs as he steps up beside you. He glances around at the eggs on the walls. "Perhaps it'll stem the tide of those creatures outside, too."
"Uh, yeah. Maybe." You reply half-heartedly. Why did she blow herself up? Did you really give her enough reason to hate you that much?
As Quelaag's corpse cools, you notice a faint glow amid the embers. You leap over the lava to investigate and find a warm soul glowing in her chest. It's golden white but has flickers of red-orange flame mixed in, akin to how your soul gem looks after accumulating corruption. You reach out to the soul and feels strangely solid in your hand. Still wispy and fluid, but somewhat physical at the same time.
As you lift up the soul, dark shadows linger in its place. Strange black shapes burn up through Quelaag's chest and dance about in the air just above her skin. You remember Oscar picking up something similar at some point. Humanity sprites.
[] Take the soul
[] Take the humanity sprites
[] Take both
[] Leave them both