The world finally faded to black.
The agonizing, burning strain of holding back a frenzied, primordial monster proved to be the final straw for Yoriichi's severely overtaxed mortal vessel. The jagged, crimson mark on his forehead, which had pushed his Dou Zhe physique into the realm of gods and demons for a few fleeting minutes, rapidly receded, leaving his skin pale and blisteringly hot.
His knees buckled. Without another word, Yoriichi's grip on Xiao Yu's waist went slack, and he slumped forward, plummeting into absolute, suffocating unconsciousness.
Feeling the sudden, terrifying deadweight of her brother collapsing against her, the wild, chaotic frenzy raging within Xiao Yu's mind abruptly snapped. The blinding haze of wrath evaporated, replaced instantly by a surge of pure, icy panic.
She dropped to her knees, catching Yoriichi before his head could strike the damp earth.
"Ning'er... Ning'er!" she whispered frantically, her voice trembling.
She looked at his completely battered state. His clothes were shredded, his chest and arms laced with deep, sluggishly bleeding wounds, and his skin was terrifyingly hot, radiating the residual heat of a furnace on the verge of exploding.
Xiao Yu looked up at her surroundings. The cove was a disaster zone of shattered rock, scorched earth, and frozen blood. The assassin had fled, leaving behind nothing but his severed arm and a silver spatial ring lying in the dirt. The dense, oppressive miasma of the Abyssal Trench seemed to creep closer, the smell of blood undoubtedly acting as a beacon for every Rank 2 and Rank 3 magical beast within a ten-mile radius.
She was alone. Her brother, her invincible, stoic anchor, was completely incapacitated. She looked down at her own hands, at the strange, frosty silver hair cascading over her shoulders, feeling a whirlwind of complicated, terrifying emotions.
But as the distant, guttural howl of a magical beast echoed through the forest canopy, Xiao Yu realized she didn't have the luxury of fear. If she didn't act now, they would both die. She swallowed her panic, her new, ice-cold Dou Qi surging through her veins as she grabbed the assassin's dropped ring, hoisted her brother over her shoulder, and vanished into the shadows.
Time lost all meaning in the dark.
A few days later, a low, hoarse groan echoed within the confines of a dimly lit space.
Yoriichi's eyelids fluttered, feeling as heavy as lead. He slowly forced them open, his vision blurry and swimming with dark spots. The first thing that gradually came into focus was a rough, uneven ceiling made of jagged grey rock. A faint, flickering orange light danced across the stone, casting long, shifting shadows.
It was a bonfire, situated a few feet away, its embers glowing a dull, dying red, signaling that it was nearing its absolute end.
'A cave... or some form of natural stone structure,' Yoriichi's analytical mind booted up, fighting through the thick fog of exhaustion.
As he lay completely flat on his back, attempting to command his limbs to move, he suddenly realized he was not alone. He felt a soft, steady weight pressing intimately against his right side. A slender arm was draped carefully over his chest, and a head was tucked securely into the crook of his neck.
He didn't need his Transparent World vision to know who it was. The faint, rhythmic sound of slight snoring, coupled with a deep, soothing aura of absolute coldness, gave it away instantly.
It was Xiao Yu.
Yoriichi tilted his head slightly. In the dim, dying light of the bonfire, he could see her features. The shocking, mysterious physical changes awakening were still vividly present. Her previously black hair was a striking, ethereal silver, fading into delicate, light-pink tips at the ends. Her skin, even in sleep, radiated a profound, frosty chill that permeated the air around them.
She was clinging to him defensively, even in her deep slumber, as if terrified that if she let go, he would vanish into thin air.
Moving with the agonizing slowness of an old man, Yoriichi began to extract himself. He moved by millimeters, shifting his weight with absolute precision to ensure he didn't disturb her arm or wake her.
'Do not move abruptly,' he commanded his body.
Every single bone, muscle, and meridian in his body screamed in unified, blinding agony. The backlash of forcing the Demon Slayer Mark to manifest without the proper foundation was astronomical. It felt as though thousands of microscopic needles were simultaneously piercing his muscle fibers from the inside out.
Despite the torture, Yoriichi managed to silently untangle himself. He sat up, leaning heavily against the cool stone wall behind him.
He looked down at his own body and blinked in mild surprise.
From his torso to his back, down his arms, and all the way to below his ankles, he was meticulously, tightly wrapped in white linen bandages. Even the left side of his face and neck had thin strips of cloth carefully applied. Beneath the bandages, he could feel a thick, cooling medicinal paste.
The air was heavy with the pungent, earthy scent of crushed Blood-Clotting Grass and White-Lotus Root—common, yet highly effective healing herbs found in the outer trenches.
He knew instantly that all of this was her work.
Yoriichi cast a quiet, profoundly admiring glance at his sister's sleeping figure. To navigate a bloodthirsty forest while carrying a deadweight, find a secure location, gather specific medicinal herbs, crush them into a paste, and meticulously dress a dozen deep wounds without panicking... it was a monumental feat of survival.
Furthermore, Yoriichi realized why he hadn't succumbed to the sheer thermal shock of his own Sun Breathing. The residual coldness radiating from Xiao Yu's newly awakened physique had acted as a natural, perfect counter-balance. While she held him, her Yin-aligned aura had seeped into his meridians, aggressively suppressing the rampaging, self-destructive Yang energy of his solar flames, slowly curing the internal burns that pills alone could not fix.
Using the stone wall for support, Yoriichi slowly pushed himself to his feet. His legs trembled violently for a few seconds before stabilizing.
He dragged his feet toward the entrance of the cave to assess their tactical position. As he reached the mouth of the cavern, he was met with a thick, roaring wall of rushing water.
Yoriichi's eyes widened slightly in genuine surprise.