Ren Zu sat on the cold floor of the cavern.
His chest heaved with the agonizing effort of simply drawing breath. Each inhalation was a battle against the crushing weight of the darkness, a desperate struggle to pull thin, stale air into lungs that were stiff like old parchment. He was dying. He knew it with the certainty of a falling leaf knowing the ground. His journey had stripped him of everything—his youth, his strength, his wisdom, and his pride. All that remained was a stubborn, glowing ember of Hope and the two strange insects resting in his trembling palms.
In his left hand sat the Regulation Gu. It was as black as the abyss that surrounded them, a cube of absolute darkness cut from the void itself. It sat heavy and cold, pressing down into his flesh with the density of a collapsed star. It did not move; it did not twitch. It was the physical embodiment of the Anchor—the immoveable object, the unyielding wall, the silent "No" that the universe speaks to chaos. Its sharp corners dug into Ren Zu's skin, a constant, painful reminder of the necessity of limits.
In his right hand sat the Rules Gu. It was the complete opposite. It was white as the purest mutton-fat jade, radiating a gentle, internal warmth that seeped into Ren Zu's freezing fingers. It was light, almost weightless, hovering slightly above his skin as if eager to fly. It spun slowly in place, a perfect sphere of endless motion. It was the Wheel—the momentum, the adaptation, the fluid "Yes" that allows life to navigate the obstacles of existence.
Ren Zu looked at them, his vision blurring. Square and Round. Heavy and Light. Cold and Warm. Stop and Go. He held the two halves of the universe in his dying hands.
As the two Gu worms sensed each other's proximity—a closeness that perhaps had not occurred since the dawn of time when the world was first split from chaos—a strange, resonant vibration began to hum through the air.
It started in his hands, traveling up his withered arms, past his aching shoulders, and settling deep into his chest.
It wasn't the fiery, explosive rush of power he remembered from his days with Strength Gu. Strength had been a roaring furnace, a chaotic surge of adrenaline that made him want to scream and conquer and break things. Strength was wild, untamed, and exhausting.
Nor was it the cool, detached stream of clarity he remembered from Wisdom Gu. Wisdom had been a palace of ice, a silent, isolating precision that dissected the world into cold facts and lonely calculations. Wisdom was sharp, arrogant, and distant.
This vibration was entirely different. It was terrifyingly steady.
Thump-thump. Thump-thump. Thump-thump.
It pulsed with a rhythmic, mechanical perfection. It felt like a heartbeat that was incapable of skipping, a drum that would never miss a beat. It sounded like the marching of ten thousand iron-clad soldiers stepping in perfect unison, their boots shaking the earth. It sounded like the grinding of massive stone gears turning the axis of the heavens. It was the hum of a great machine waking up.
It was the sound of Order.
"Human," the two Gu spoke. They did not speak separately this time. Their voices merged, defying the silence of the cave. The rigid, bass rumble of Regulation and the fluid, melodic alto of Rules blended into a singular, commanding tone. It was a voice that allowed no argument, a voice that demanded instinctive submission.
"You hold the Circle and the Square," the dual voice intoned, echoing not just in the cave, but in Ren Zu's soul. "You hold the duality of the Great Dao. The solid earth and the rolling sky. The cup and the water. The law and the method. We have been waiting for a master who understands both. Now, you must use us."
Ren Zu looked down at them, his old eyes swimming with confusion and fatigue. Tears of frustration welled in the corners of his eyes.
"How?" he rasped, his voice a broken ruin of sound. "Look at me. Truly look at me. I am old. My hands shake like dry leaves in a winter gale. My legs are useless. I cannot run. I cannot hunt. I cannot chase the Lifespan Gu."
He coughed, a wet, rattling sound. "Lifespan Gu is the fastest thing in existence. It is faster than light. It is more elusive than a dream. Even when I had the legs of a giant and the eyes of an eagle, I could not catch it. Now... now I am just a dying old man sitting in the dark. How can I possibly chase it?"
The Rules Gu in his right hand spun faster, its white light blurring into a halo.
"You do not chase," it whispered, its voice sounding like the wind whistling through a canyon. "Chasing is for beasts. Wolves chase deer. Hawks chase rabbits. They use their bodies. They use their sweat and blood. That is the way of the savage. That is the way of the wild."
"Human is not beast," the Gu continued. "Human is the spirit of all living beings. Beasts adapt to the world; humans make the world adapt to them. Beasts use claws; Humans use tools."