The fourth room was the largest so far.
High ceiling.
Dark stone floor with no trap tiles.
Open space in all directions with two pedestals facing each other in the center — not together, but separated by twenty meters with a dividing line of blue light between them.
"ROOM FOUR: The Hunter's Duel!"
"Simple rules! Each participant will face their own opponent simultaneously! They may not interfere in the other's combat! The first to defeat their opponent wins! Special condition: participants' powers remain limited to standard human level! Opponents' powers... do not!"
Kai looked at the dividing line.
Then at Serah.
"We can't help each other?"
"Correct! Separate lines, separate fights!"
Serah looked at the line with the expression of someone who'd just been put on a leash.
Before she could say anything, the opponents appeared.
---
On Kai's side: a female figure, about five-foot-seven.
White hair cut to the jawline.
Skin with a texture slightly different from human — too uniform, too perfect.
Amber eyes with no visible pupil.
She wore functional combat clothing, no armor, with runes engraved on her forearms pulsing faint blue.
Android. Magical. And with the posture of someone who's won enough fights.
On Serah's side: a man. About six feet, athletic build, black hair, apparent thirties.
Hands covered in old burn scars — the kind left by repeated use of intense fire magic.
---
[GarcíaFTW: A MAGICAL ANDROID AND A FIRE MAGE]
[NocheEterna99: Kai's got an "interesting" face. Serah's got a "this'll be over quick" face]
[StreamerHunter: viewers: 400,000.]
[xSorinx: opponents have no power limits. KAI FIGHTS WITHOUT MAGIC AGAINST AN ANDROID WITH MAGIC.]
---
The android moved first.
It wasn't an attack meant to bring him down — it was an assessment.
A reading of how Kai responded to sudden movement.
Kai didn't respond.
He registered.
Lateral shift from the hip. Weight on the back foot. She's reading my defensive reaction.
Good. She does the same thing I do.
The android spoke.
"Interesting." Her voice was clear, with no recognizable accent. "You didn't move."
"There was no reason."
"Most step back when I move."
"Most aren't assessing the same thing you are."
The android tilted her head three degrees.
The runes on her forearms glowed.
"What are you assessing?"
"Your center of gravity." Kai adjusted his guard posture — minimal, barely perceptible.
"It's lower than it should be for your height. That means your lower structure is denser than your upper. Strikes you throw from above will have less mass behind them than ones coming from your center."
The android looked at him for a second.
"No one's ever told me that before."
"Does it bother you?"
"On the contrary." The runes glowed brighter. "I find it fascinating."
---
On the other side of the blue line, Serah faced the fire mage.
The first attack was direct — a wave of compressed fire launched without warning from an open palm, enough heat to melt stone on direct contact.
Serah rotated her body fifteen degrees.
The wave passed four inches from her side.
Kai's technique. It works.
The mage looked at her.
"Did you just dodge my fusion magic using only body movement?"
"Yes."
"No active defensive power."
"My powers are limited."
The mage processed this.
Then smiled — not with arrogance, but with the genuine pleasure of having found an interesting problem.
"Good," he said. "This is going to be different."
He launched three projectiles simultaneously — divergent trajectories, angles calculated to leave no lateral escape.
Serah assessed them in the second she had.
Right blocked. Left blocked. Center...
She went to the ground — not to dodge, to reduce profile — and the three projectiles passed over her.
She rose in a second.
The mage had an expression that wasn't exactly surprise, but it resembled it.
---
On Kai's side, the android had fully activated the runes.
What followed wasn't a standard magic attack — it was something more precise.
The runes generated localized force fields, small ones, that the android used to amplify the speed and impact of her physical strikes at specific points.
It wasn't bombardment magic.
It was precision magic integrated into hand-to-hand combat.
This is new.
The first strike came from the left — straight punch with a rune activated on the knuckle, speed increased forty percent over the base movement.
Kai blocked with his forearm, absorbed the impact by turning with it, and used the momentum to reposition toward the android's right flank.
The impact numbed his arm up to the elbow.
Strong. Too strong for the size of the strike.
But the force field has an activation radius. She has to be within that radius to use it.
The android repositioned quickly — faster than a human, but with the predictable movement pattern of something operating on fixed parameters.
Kai threw a jab to the right shoulder.
The android activated the forearm rune to block.
Kai pulled the jab halfway and struck with his left elbow to the side, outside the active rune's radius.
The android stepped back.
"You identified the activation radius," she said.
"Yes."
"When?"
"Second exchange."
The android looked at him with something that, on a face designed not to express too much, was the closest thing to delight it could show.
"You are extraordinarily observant for a human being."
"Thank you."
"It wasn't a compliment — it was an observation." A pause. "Though I suppose it was also a compliment."
---
[NocheEterna99: KAI AND THE ANDROID ARE HAVING A CONVERSATION DURING THE FIGHT]
[GarcíaFTW: they're complimenting each other while hitting each other]
[StreamerHunter: "it wasn't a compliment — though I suppose it was also a compliment" — the android has CHARISMA]
[xSorinx: Serah can see this from the other side of the line]
---
Serah could see it from the other side of the line.
She was still fighting — the fire mage was serious enough to require attention — but the blue line was translucent and what was happening on the other side was completely visible.
Kai dodged a strike from the android with a hip rotation that Serah recognized — the same one he'd taught her before.
The android said something.
Kai responded.
The two exchanged something that, from a distance without clear audio, seemed...
Animated.
---
In Serah's mind, unbidden, the image completed itself.
---
In Serah's mind:
Kai and the android, no dividing line, no combat. Just the two of them in some neutral space with warm light.
The android, with that clear, unaccented voice, saying to Kai: "I've never met anyone who fights like that. It's... fascinating."
Kai answering her with that calm of his, that calm Serah had spent weeks trying to decipher: "You're different too. Not like anything I've seen in Aethon."
The android moving closer. Her runes dimmed. No longer as an opponent.
"Could I... learn from you? Like you learn in combat."
And Kai... the same Kai who told Serah no at minute eight of the stream, the same Kai who treated her proposal for offspring as a minor logistical detail — looking at her with something different.
"If you want," he said.
The android with an expression machines shouldn't be able to have.
"And if I want more than to learn?"
Kai not answering immediately. Considering it.
"Would your offspring be strong?"
"They would be unique. Magic and technique. Nothing like them has existed."
Kai nodding slowly. "That's... interesting."
---
Serah snapped back to the present.
The fire mage launched a column of fire from below — an upward attack, hard to dodge with limited mobility.
Serah dodged it.
But her eyes stayed on the blue line.
Kai had deflected another strike from the android and was saying something to her.
The android tilted her head in that specific three-degree way — the same one she'd done before when she found something fascinating.
That tilt.
She finds him fascinating.
He does too.
Serah's silver markings stopped pulsing at their normal rhythm.
They began to accelerate.
---
[xSorinx: Serah's markings are accelerating]
[NocheEterna99: that's not good]
[StreamerHunter: Serah is looking at Kai and the android with an expression I haven't seen before]
[GarcíaFTW: that's not normal jealousy. that's something deeper.]
---
On Kai's side, the android had changed tactics.
She was no longer using the runes at individual points — she was activating them in sequence, creating a shifting force field pattern that anticipated Kai's movement before it happened.
It was real-time adaptation.
She's learning my pattern.
Good. I'm learning hers too.
The problem was the android's pattern updated faster than a beast's or a human's.
Every time Kai found an angle, the field repositioned on the next exchange.
I need something I haven't shown yet.
Kai changed the rhythm completely — instead of his usual wait-and-counter cadence, he pressed.
A series of three quick strikes to the torso, not seeking damage, seeking to force the android to activate the runes defensively rather than offensively.
The android blocked all three. Defensive runes active.
The moment the three runes were committed to defense, Kai threw an open-palm strike to the shoulder with the specific angle that destabilizes a low center of gravity — the one he'd identified at the start.
The android lost balance for 0.3 seconds.
Enough.
Kai seized the moment with a control hold — not to damage, to immobilize.
The android's arm bent back at the exact angle that neutralized rune activation without breaking anything.
The android was immobilized.
She didn't struggle. She assessed.
"You used my defenses against my offense," she said from the immobilization position, with the same analytical tone as always.
"Yes."
"Clever." A pause. "Will you release me if I promise not to activate the runes?"
"Would you keep that promise?"
"I am an android. I do not process broken promises as valid options."
Kai considered this.
He released her.
The android repositioned, shook out her arm, and looked at him with that three-degree tilt.
"You are the most interesting opponent I have processed," she said.
"You too," Kai said.
---
What Serah saw from the other side of the blue line was Kai releasing the android.
The android looking at him that way.
Kai answering her something.
And the two of them, for a second, completely still, looking at each other.
The fire mage launched his strongest attack yet — a sphere of compressed fire the size of a torso, enough heat to be felt from sixty feet away.
Serah blocked it with her forearm.
Her bare forearm.
Without dodging.
The fire dissolved on contact.
The mage looked at his own attack dissipating.
Then at Serah.
Serah's silver markings were no longer pulsing.
They glowed steady, intense, with the light Kai had learned to associate with when Serah's form control began to slip.
"Your powers shouldn't be active," the mage said, with the voice of someone urgently recalibrating.
"No," Serah said.
"How are you blocking fusion magic with your body?"
"Because," Serah said, and her eyes went from clear ice to something brighter, colder, older, "I am very upset."