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It was dark beneath the precursor temple. The ruins were a labyrinth of ancient corridors, dug deep into the bones of the planet. The orb lights along the walls were buzzing and dim, long passages of tunnel gone completely dark.

Jak had lost track of the number of hallways he turned into, much less the paths taken. The doors opened into increasingly-bizarre laboratories, but increasingly didn't open at all. The last one, at the end of the corridor -- the first dead-end he'd seen so far -- opened with difficulty, ancient machinery finally dying halfway through, leaving the door half-recessed.

The room beyond that was cantilevered, opening onto a balcony that was one of many, ringing a complex device in the center of the room. There were shining towers on each balcony, in a ring, lenses and mirrors peeking out all over. Below -- and above -- there was just blackness; the room suspended in the middle of some vast subterranean pipe.

The device in the middle, though: something built in the shape of some long-dead animal, with glowing orbs for eyes, haphazardly-bundled piping for a trunk, and who-knew-what for the tusks. A Precursor oracle. It whirred to life as Jak stepped forward, out onto the balcony.

"Oh chosen one," came its voice, slurred like a recording played in slow-motion, slowly gaining speed. "Sealed away, sealed away. The great power."

"Uh, hey," Jak said.

Things inside it clattered, rotating rings around it activating with a dull whirr. "We awake," it said. "Lost, forgotten, cursed." The parts circled faster above it, a rising hum building.

Jak stepped closer, looking at the whirling machine, looking down into the blackness below. The oracle kept talking, incoherent mumbling, voice layered with burring static.

Its eyes swirled in their casing, rolling wildly before focusing on Jak. "Do you accept?"

"The great power," Jak said, slowly. "Sure, why not." So far the weird precursor statues had done him pretty well, at least.

The statue howled, vocal distortion turning its voice into pops and crackles, echoing hollowly up and down the vast inner space, coming back as a wordless tone, low and resonating. The devices arrayed around it surged to life.

Jak could smell it. Dark Jak, Light Jak, whatever: eco had a smell to it, sharp and vivid, almost dizzyingly potent as some sealed vents opened with a clatter. The apparatus sung, yellow-purple arcs bursting back and forth in crackling arcs between the towers, until, with a crashing jolt, they earthed in him.

It hurt -- less than Dark Jak, but that wasn't setting much of a threshold -- as it burnt over his body, touching the crown of his head and grounding down his spine, all in a single instant, leaving him spasming and breathless in the aftermath. The storm of eco continued, building up into a churning haze around him, lesser bolts crackling through the cloud, shocking his body in little shuddery jolts.

Things felt... different, already. Jak twisted to the side, facing the tangled tower at the edge of the balcony, and caught a glimpse of his face. He raised a hand to his forehead as if to make sure it was really there: slotted in the center of his forehead, an electric gem, miniature arcs bursting across its insides. A Metal Head skull gem. Even as he watched, his fingers resting on its smooth, hard surface, it shone bright, dark splotches growing out from it, across his skin.

Also, his clothes were smoldering, thin lines with charred edges burnt through where the bolt had -- and more continued to -- pulsed through him.

He stared blindly at his reflection, hand slowly spreading over his head as the black patches grew. They felt strange, to the touch and also on his face, leathery-smooth, pebbled, and not more sensitive so much as differently sensitive, less feeling but much more pressure-sensitivity. He dragged his fingers back and forth, something like oil building on his fingertips, slick and iridescently shiny.

It was a shuddering rush of sensation as it spread over his scalp, muscles in his neck and cheeks spasming as his skin went sallow-dark before the shift, some strange heat pooling in his brain, under his skin, as the transformation sunk deeper.

Dark Jak was a searing pain as his muscles thickened, snapping and reforming in thicker slabs, but this sunk bone deep, planes in his face suddenly more defined as his bones stretched under his skin. They creaked like stiff wood about to break, crackling as his face deformed.

A new thickness built up under his fingertips, hard and smooth and warm. He just stared at the almost-unrecognizable shape of his transforming face as smooth metallic chitin grew from under his skin, pushing it out of the way in flaking sheets, dull and two-toned, half skin and half hide. Dazed, he pulled at the sheets, pulling them away from his cheeks as angular plates emerged, extending up his stretched face, down further as his jaw cracked out into a stubby muzzle. His goggles snapped, the rough edge of a facial spur growing beneath the strap, and he caught them; dropped them onto the floor, their clatter masked by the sound of his breathing, suddenly deeper and rougher.

His breath caught in his throat, ragged and wheezing, and when he tried to speak it came out almost unintelligible, resonating in his throat deep and rough, growling, animalistic. His spine ached, popping like a joint pushing back into place, and suddenly he felt more... flexible, neck twisting further as he watched thick spinal ridges push out down his back, lumpy under his clothes until the fabric split on the lightning-burns, flaking off him like just so much shed skin.

When he looked back at the mirror, he looked... new. It was the face of a Metal Head: burning yellow eyes, scintillating gem. His face was stretched, nose now a thick muzzle, with his mouth extended to match, into a heavy jaw full of sharp teeth. Shining metallic crests framed his face, running just above his ears, fanning out into thick, short horns. His ears, too, were changed -- shorter, a little, but thicker, and finned in reptilian spines, heavy on the sides of his face. His hair was still there, black pigment creeping up the strands as he watched, until he had a head of shaggy green-black hair.

His spine ached, ridges pushing from his back in an interlocking pattern one after the other, chunky spikes growing in afterward on each one. The motion didn't stop when he ran out of spine; dizzily he staggered forward as a new weight grew between his legs, a smoothly-articulated tail growing from his back, long and tapering into thin, delicate bones and finally ending with a whipcord lash, thin and slender. It hardly felt under his conscious control, twisting in complex loops around his hips, wrapping around his stomach and thighs without once ever touching his skin or itself, cutting trails in the eco haze around him with its rapid movements.

Shuddering, more energy earthed itself into his spine. The spikes acted like lightning rods, jutting out into the storming cloud around him, drinking in its burning bolts of eco energy. His muscles ached, swelling and shifting, becoming longer and lean as his entire body lengthened, becoming something wilder and more animalistic. Dark skin stretched over his back in smooth lines, glossy black as it curled over his chest, down his sides. His shoulders ached, more chitin emerging over the line of his shoulder-blades, and near-identical spurs pushed out across his hips, like overlapping teeth, sharp and curling. There was a tension, his belt catching against the metal, but it pushed harder, jagged edges slowly peeling through the leather until it snapped apart.

His channeling ring was the sole clothing across his upper body, shreds of his shirt stuck between it and his hide. The leather straps were tight across his chest, stretched over new muscle and riding up as he moved, but they narrowly avoided the same fate as the others, passing an inch away from his shoulder plating, slotting neatly between the spurs of his spine.

Jak watched the change spread down his arms, muscle thickening. He pulled scraps of fabric from the circle of his precursor ring. It was burning cold, coiling with the eco mixture around him. There was some new response -- not goosebumps, but some change in sensation, tense and less flexible, as it settled against his bare chest. His hide there was glossy, oily-iridescent, his muscles sharply defined but in alien structures. And it was lighter, green-black, mottled at the edges: the soft skin of his underbelly. He dragged his changing hand down his stomach, sensation dizzy-potent, the contact and then the rough scrape of claws so strong over the sensitive skin it felt like some entirely new sense, some throbbing, strobing pull all across his front.

It seemed natural to keep going, the heavy pads of his new hands digging into the soft flesh of his stomach, slowly creeping downwards, pushing away the clinging fabric still stuck to his chitin. It was... new. Green-black hide, soft and supple, and pulled up in a looping ridge, clinging tight between his thighs, just between the rough slabs of chitin across his outer hips, and then below that the new heft of his balls, achingly heavy and covered in the same dizzyingly-sensitive skin as the rest of his body, wrist gliding over his sheath, clawed thumb tracing the swell of his balls.

He arched up on his toes as the transformation finally hit his legs, feet warping as they stretched into something longer, toes fanning out in an almost-webbed structure, thick tissue between the spurs of his new claws. He took a staggering step forward, shuddering, then fell, his hips shifting so that he landed naturally, on all fours, ready to pounce. His tail lashed above him, tasting the eco as it finally dissipated, the last arcs sinking into his spine before the machines went dead.

His fingers -- paws, now, maybe -- splayed across the ground, walking as natural on them as walking on two had always been, but with a moment's concentration he could push himself up, balance on the huge flat pads of his feet. His weight was held so differently, lower and further forward, and his first steps were shaking, awkward things, almost bowlegged.

His skin itched: dry, flaking sheets still stuck around his hips, on the sharp heel of his elongated foot, and he found himself scratching against the balcony, rubbing off thick layers of dull skin, the air suddenly feeling... cool, wetly moist, tasting a thousand tiny temperature gradients and movements along his skin. Air was billowing up from below, in slow, lazy motions: too subtle for him to notice before, but almost painfully noticeable now, his own body heat sending heated air up in billows across his back, cool air sliding down his chest, coiling between his legs.

His earlier touches had started it, some new heat growing between his thighs, tense inside him. His stomach shuddered, strange tension spilling across his underbelly as the ache inside him grew into a solid weight. He was dizzy with the sensation of it as his new cock unsheathed itself, crested and spined and covered in whorls of fat pearls, a richly-glistening green-black, shining with some new effluence as it emerged from between his thighs, each fat knob of just dragging across the inside of his sheath as it spilled out from him.

The sensation was just too much; he found himself humping the ground like an animal, cock wet and heavy, smearing oils across his stomach, across the floor, until he was just grinding against a minute groove in the floor, animal growls coming rough and low from his changed throat, cock fat and squishing against the floor as he thrust in ragged lunges. His balls smacked the floor, overwhelming bursts of pleasure-pain coursing through him at the rough contact, but his body loved it, cock drooling precome in a constant glossy stream.

It was embarrassing how short he lasted, not even a minute before the new sensation swirling through his body was too much. He raised his head and bayed, thick eco-streaked come spraying from his cock, all vivid yellow and purple, electric, glowing, mixing into a bubbling, streaked froth as he fucked his cock through the thick mess, hips pounding against the floor as he spent himself in messy streamers all across the length of the balcony.

He collapsed to the ground, exhausted, jizz smearing all across his stomach and chest. Drained of eco, the transformation shattered itself, chitin softening and skin thinning in mottled patches all across his body. He spasmed and twitched, gasping as his tail was practically slurped up inside his body, until he was just lying there naked save his channeling ring, breathing hard, smeared in thick eco dregs.

It was minutes before he could drag himself up into a sitting position, come squelching under him as he moved. "Hey, statue," he said, voice rough at the edges. "Think you could give me another dose of that?"