It started with a wolf.
Not one of the small ones — not the mangy, skittish things that slunk around the edges of the dead zone and bolted the moment they sensed him. This was something else. Chest-high, black-furred, built like a truck with teeth. It came out of the regenerating tree line at a full sprint while Yuki was practicing barriers, and it covered the distance between them before he could switch gears.
He threw up a shield. The wolf hit it. The shield held — but his fireball didn't. He'd been charging one in his right hand when the wolf appeared, and the moment he redirected focus to the barrier, the fireball guttered out. Just dissolved. Like dropping a ball to catch another one.
The wolf bounced off the shield, scrambled to its feet, and lunged again. Yuki dropped the barrier and punched it with a reinforced fist. The wolf went sideways, hit a dead tree, and didn't get up.
He stood there breathing hard. Not from the fight — from the realisation.
I can't do two things at once.
That was a problem. A serious one. In a real fight — not against one wolf, but against multiple enemies, or something fast, or something smart — he'd need defence and offence simultaneously. Shield and sword. Barrier and blast. Awareness and action. If he could only hold one spell at a time, he was a sitting duck the moment he attacked.
Every game I've ever played lets you block and strike. Why can't I?
Because those were separate button inputs controlling separate systems. His magic ran on a single thread of consciousness. One focus. One visualisation. One spell. When he tried to hold two images at once, the weaker one collapsed.
Unless he could run two threads.
The idea was insane and he knew it. Human brains didn't work that way. You couldn't genuinely think two independent thoughts at the same time — you could switch between them quickly, creating the illusion of multitasking, but true parallel processing wasn't something biological neural architecture supported.
But his brain wasn't exactly stock hardware anymore. The chain reaction had pumped him full of mana. His body was reinforced at a baseline level that made him functionally superhuman. Who said his brain hadn't been enhanced too?
He sat in the dust and tried.
The setup was simple. Left hand: maintain a small barrier, a disc of hardened mana hovering in the air. Right hand: hold a flame. Both at the same time. No switching. No alternating. Two simultaneous, independent spells, each requiring its own visualisation.
Barrier up. Flame on. Hold both.
The barrier flickered. The flame sputtered. His head felt like someone was pressing their thumbs into the space behind his eyes. He was trying to look in two directions at once — not physically, but mentally. Trying to hold two separate images in focus at the same time, like watching two movies on the same screen.
It didn't work. After about three seconds, the flame died. Then the barrier popped. His head throbbed.
He tried again. Same result. And again. Same.
For three days, nothing changed. He'd sit, form two spells, hold them for a few agonising seconds, then lose one or both. The headaches got worse. At one point his nose started bleeding, which he took as a sign to stop for the day.
Maybe this isn't possible. Maybe I'm trying to do something my brain literally can't—
On the morning of day four, it happened.
He was exhausted and frustrated and not really trying anymore — just going through the motions, barrier in the left hand, flame in the right, waiting for the inevitable collapse. His mind was wandering. Half-thinking about the barrier, half-thinking about what to eat for lunch.
Both spells held.
He blinked. Looked at the barrier. Solid. Looked at the flame. Steady. His attention was — split. Not alternating. Not flickering between them. He was genuinely maintaining two separate points of focus, each running its own process, each producing its own spell.
It felt like discovering he had a third arm. Wrong and natural at the same time.
He held it for ten seconds. Fifteen. Twenty. Then a spike of pain lanced through his temples and both spells collapsed.
But he'd done it. Twenty seconds of true parallel thought. Two independent mental threads running simultaneously.
It's not impossible. It's just a muscle I've never used.
He trained it the way he'd trained everything else — obsessively, incrementally, with zero regard for comfort.
Two threads became easy within a week. He could hold a barrier and cast offensive spells without either wavering. Shield in the left, fireball in the right, wind lance from a kick — three outputs from two threads, one handling defence while the other cycled through attacks.
Then he pushed for three.
Three was brutal. The headaches came back with force. His vision doubled sometimes — literally, like his eyes were trying to look in different directions. He had nosebleeds daily. He lost the ability to speak coherently for about an hour one afternoon because thread three kept hijacking his language centres.
But it stabilised. A week of grinding and thread three became as natural as the first two. Defence, offence, and a third thread dedicated to sensory awareness — constantly scanning his surroundings with mana sense, monitoring for threats in every direction simultaneously.
Four threads took less time. Five took even less. Each new thread was easier than the last, like his brain was building infrastructure. New pathways. New capacity. By the end of the month, he could maintain five parallel thought processes without strain.
Five threads meant he could defend, attack, sense threats, manage his mana output, and still have a thread free for general thinking. He was a one-man war room — strategist, soldier, sensor array, and commander all running in parallel.
This is the most broken thing I've learned so far. And that's saying something.
Then he discovered thought acceleration, and "broken" got a new definition.
It happened during a reflex drill. He'd been practising reaction speed — throwing rocks into the air with mana and trying to hit them with pinpoint wind lances before they landed. A hand-eye coordination exercise. Simple.
One of the rocks went wide. He reached for it with a wind lance and felt his mind lurch — like shifting into a gear he didn't know existed. The world slowed. The rock hung in the air, barely moving. Dust motes froze around him. His own heartbeat became a slow, deep drum.
He watched the rock drift for what felt like five full seconds. Then he flicked a wind lance at it — casually, with all the time in the world — and shattered it.
Time snapped back to normal. The rock fragments scattered. The whole exchange had taken maybe a quarter of a second in real time.
Did I just... speed up my brain?
He had. Mana reinforcement worked on muscles, bones, nerves — why not neurons? By flooding his brain with mana, he'd accelerated his cognitive processing to several times its normal speed. The world didn't actually slow down. He just thought faster.
The applications were immediately obvious. Thought acceleration in a fight meant he could perceive incoming attacks in slow motion, plan responses with time to spare, and execute with precision that would look superhuman from the outside.
Combined with parallel thinking, it was absurd. Five independent thought threads, each running at accelerated speed. He could analyse a battlefield, coordinate multiple spells, track multiple opponents, manage defense and offense, and maintain environmental awareness — all simultaneously, all in what felt like slow motion.
He tested it against the training exercises he'd been running for weeks. Rock-throwing drills. Obstacle courses through dead trees. Simulated multi-angle attacks using mana constructs he launched at himself.
Everything felt easy. Trivially, almost boringly easy. Threats he'd struggled with at normal speed became slow-motion puzzles with obvious solutions. He could dodge, counterattack, and reposition before the incoming projectile had crossed half the distance.
He sat down afterward and stared at his hands for a long time.
I need something real to fight.
The dead zone was shrinking.
He'd noticed it weeks ago — green creeping inward from the edges, the forest slowly reclaiming what he'd destroyed. New growth. Young trees pushing up through grey dust. Grass spreading in patches. Insects returning. The ecosystem filling the vacuum.
And with the ecosystem came the monsters.
They started small. The wolves came first — scouts and scavengers, testing the boundaries of the new territory. Then larger things. Boar-like creatures the size of small cars, armour-plated and aggressive. Giant insects — centipedes as long as his arm, beetles with mandibles that could shear branches. Reptilian things covered in overlapping scales that shrugged off his early testing strikes.
Yuki started hunting.
Partly for food — smoked monster meat had become a staple and he was running low. Partly for materials — hides, bones, claws, and the occasional crystalline organ that seemed to be this world's version of a monster core. But mostly for practice. Real, life-or-death combat practice against opponents that didn't follow scripts and didn't hold back.
The wolves were easy. Fast but fragile — a single reinforced strike put them down. He used them to practice efficiency. Minimum force. Clean kills. No wasted mana, no wasted movement.
The boars were harder. Their armour plating deflected glancing hits and they charged with enough force to uproot trees. He learned to use their momentum against them — sidestepping at the last second and driving a mana blade into the gap between their neck plates. The first time he mistimed it and got clipped by a tusk, the impact threw him thirty metres and cracked three of his mana-woven jacket's reinforcement strands. He landed on his feet, fixed the jacket, and went back in with a better angle.
The insects taught him area denial. They came in swarms — dozens of chitin-plated bodies boiling out of the undergrowth. Individual kills were pointless. He developed wide-effect spells instead — pressure waves that crushed everything in a radius, temperature drops that froze them solid, concussive blasts that scattered swarms like leaves.
The armoured lizards were the best training. Tough, smart, and aggressive. They hunted in coordinated pairs, flanking and feinting like they'd trained for it. Fighting two at once forced him to use parallel thought in live combat — one thread per lizard, a third for his own movement, a fourth monitoring for ambush.
Weeks passed. His combat instincts sharpened. The gap between encountering a threat and neutralising it narrowed to fractions of a second. He stopped thinking about spells and started fighting — mana flowing on instinct, body moving on reflex, parallel threads handling the complexity while his conscious mind focused on strategy.
He was getting good. Really good. And that made him nervous, because he had no frame of reference for what "good" meant in this world.