The knock came at midnight. Two sharp raps, then one soft one.
Cain was already awake. He'd been reviewing Ao Lie's blood knowledge in his mind, organizing the dragon's four-thousand-year legacy. The memories were vast and chaotic—a library with no catalog—but three weeks of work had revealed the broad outlines: blood as a medium for storing life energy, blood refinement as a method for converting biological potential into cultivation power.
He opened the door.
Yin Wuji stood in the darkness, his white hair catching the light from a distant spirit lantern. He looked worse than he had three weeks ago. The scarring on his qi channels had spread, visible now as faint grey lines along his jaw and throat.
"Get dressed," Yin Wuji said. "We're going somewhere."
"Where?"
"Somewhere you can't be seen asking questions about." The old man turned and walked toward the western edge of the disciple quarters.
Cain followed.
---
They walked for ten minutes through back paths that Yin Wuji clearly knew by heart—trails that avoided the sect's formal patrol routes, gaps in the perception arrays the elders had installed years ago and never updated.
The destination was a cave behind a waterfall.
The waterfall announced itself first as pressure against his eardrums—a low, constant roar that built as they approached. The air changed: dry cave air giving way to fine mist that settled on his coat like dew. The cave entrance was perpetually wet, and the smell was green and organic: moss, algae, the sweet-rot undertone of plants that grew in permanent shade.
Yin Wuji sat on a flat rock at the cave's entrance. He pulled out his gourd, unscrewed the stopper, and drank.
"Kid," he said. "I've smelled that scent on you for weeks. It's blood, but not human blood. Interesting."
"You mentioned that the first night."
"I mentioned the smell. I didn't mention what it means." Yin Wuji took another drink. "I've been a blood cultivator for sixty years. Started late—didn't awaken until I was thirty. Had to find a path that didn't require a spirit root. Blood cultivation chose me."
*He's been building to something.*
"Blood cultivation has a problem," Yin Wuji continued. "The blood you refine—animal, monster, human—carries residue. Memories. Emotional impressions. The stronger the blood, the stronger the residue. Drink enough corrupted blood, and the corruption seeps into your own blood origin. That's what turns blood cultivators demonic."
"I've noticed," Cain said.
"Yeah. You have. Because you're not refining wrong." Yin Wuji set down the gourd. "I tested you. Remember the spirit fox blood I gave you for practice?"
Cain remembered. The fox's residual memories had been almost absent. Like something had burned them away.
"Your blood origin doesn't just refine blood," Yin Wuji said. "It *purifies* it. Strips the residue, keeps the power. That's why you're not corrupted."
*The Blood Ancestor's legacy. Ao Lie mentioned it.*
"What do you want?" Cain asked.
Yin Wuji was quiet for a long moment. "I want to teach you the *Blood Transformation True Scripture*."
The name landed like a stone in still water. Cain had heard it mentioned in passing—a blood cultivation text that predated the modern era. Rare. Valuable. The kind of thing that got blood cultivators killed.
"Why?"
Yin Wuji took a long drink. "Because I'm dying. Qi deviation. Sixty years of blood cultivation, refined through methods that were never meant for human use. I've got maybe two years left."
"So you want me to learn it and save you?"
"No." Yin Wuji's voice was surprisingly sharp. "I want you to learn it because it's the right method for someone with your bloodline. I'm not asking for salvation. I'm asking for legacy."
"Meaning?"
"Meaning I teach you the scripture. You become the best blood cultivator this world has seen in a thousand years. And when you do, you remember that Yin Wuji gave you the foundation."
Cain studied him. The old man's eyes were clear—no deception, no desperation. Just the simple calculus of a man who had accepted his death and wanted to leave something behind.
"Before I agree," Cain said, "I have a question. You've been watching me for weeks. You've seen me fight. You've sensed my blood. You've probably figured out that I'm not from this world."
Yin Wuji's eyebrow rose. "That obvious?"
"The knights who chased me into the portal," Cain said. "They weren't cultivators. They used different power—holy silver, blessed fire. How strong were they, compared to what I'll face here?"
Yin Wuji was quiet for a moment. Then he grinned his gold-toothed grin.
"Now *that's* a smart question." He leaned back against the cave wall. "The ones you described—Knights of the Silver Chalice, you called them? The eight who cornered you?"
"Yes."
"The commander—the one with the emerald eyes, the one you called Van Helsing—if he stepped into this world tomorrow, he'd be a problem for a Foundation stage cultivator. Maybe even a match for an early Core Formation elder, if his artifacts were as strong as you say."
*Foundation stage. Core Formation. That gives me a scale.*
"The front-rank knights who actually fought you? The ones you cut down? Qi Refining late stage, maybe. Good equipment, good training, but their power source was external—blessings, artifacts, not their own cultivation. In a straight fight, a Qi Refining disciple with a spirit sword would have a chance against one of them. Maybe even win, if the disciple was smart."
Cain filed the information. "And the dragon? Ao Lie said he was equivalent to Core Formation before the cage formation drained him."
"Core Formation? Ha." Yin Wuji spat. "That old monster was *Nascent Soul* at his peak. Four thousand years old. He'd eaten three orthodox sect masters before they trapped him. The only reason he didn't destroy this entire region was that the cage formation bled him dry over centuries. What you drank was a fraction of a fraction of his power. And it still pushed you from early to mid Blood Refining in one gulp."
*Nascent Soul. That's the level above Core Formation. Good to know.*
"So the power ladder here," Cain said, "is Qi Refining, then Foundation, then Core Formation, then Nascent Soul?"
"Roughly. There's more above that—but if you live long enough to worry about those levels, you won't need me to tell you about them." Yin Wuji drained the last of his gourd. "The knights who chased you? They'd be a nuisance to a Foundation cultivator and a joke to a Core Formation elder. But they were smart. They used your weaknesses—silver, holy fire, numbers. In our world, strength matters. But strategy matters more. Don't forget that."
"I won't."
"Good." Yin Wuji reached into his robe and pulled out a scroll. Not new—ancient, the paper yellowed and brittle, the characters written in a style that predated the current dynasty. The moment it left his hands, Cain could smell it: dust and old ink and a spiritual weight, the accumulated *intention* of whoever had written those characters.
"The Blood Transformation True Scripture," Yin Wuji said. "Don't damage it. Don't copy it. Don't show it to anyone. Read it tonight, practice the first technique tomorrow, and if you can execute it without corrupting your blood origin, come find me."
Cain took the scroll. It was heavier than it looked.
"One more thing," Yin Wuji said. "You asked me why I won't drink human blood. Do you remember?"
Cain looked up.
"Someone asked me the same thing once," Yin Wuji said. His voice was quieter now. "My wife. Thirty years ago."
He told the story. The tavern rooftop. The moon. Mei, dying by inches from a cultivation foundation built on mismatched pills. Her accusation: *You're a coward. You could save me with your blood, but you're afraid of what it might cost you.*
Two years later, she convulsed on the floor of their rented room, black qi erupting from her pores, her meridians tearing themselves apart. He held her while she died.
*I knew you'd figure it out. Just not in time.*
Yin Wuji took a long drink. "I've spent every day since trying to learn enough to never be that helpless again."
Cain said nothing.
"The dead leave pieces behind," Yin Wuji said. "You told the dragon that. That's not weakness, kid. That's wisdom. The blood cultivators who drink human blood—the ones who go demonic—they're not evil. They're just impatient. They want power more than they want to remain themselves."
He stood, swayed slightly, and steadied himself on the cave wall.
"Read the scroll. Practice the technique. Come find me when you've mastered it." He walked toward the cave entrance, then paused. "And Cain? The first form—Blood Gathering—requires blood from a willing donor. The dragon's blood was willing because it was dying. For this technique, you'll need to find someone who gives freely. Keep that in mind."
He walked out into the moonlight and was gone.
---
Cain sat in the cave, holding the scroll, listening to the waterfall.
*Qi Refining. Foundation. Core Formation. Nascent Soul. Van Helsing would be a match for Foundation, maybe early Core. The knights who actually fought me were Qi Refining level.*
*I'm at mid Blood Refining—which seems to map roughly to mid Foundation, maybe a little lower. But my bloodline gives me advantages they don't have.*
*And I have a scripture to learn.*
He unrolled the scroll. The characters were archaic, but Ao Lie's memories made them legible. *Blood Transformation True Scripture*: a cultivation manual for converting blood into life energy, storing it in the blood origin, and releasing it as combat power.
*Willing donor. Yin Wuji said the dragon's blood was willing because it was dying. What he didn't say was that Ao Lie *chose* to die for me. Chose to give me his legacy.*
Cain thought about legacy. About Mira, burning in a cathedral that no longer existed. About the blood he'd drunk to survive—a daughter's last gift, paid forward in a world she would never see.
He began to read.
By dawn, he had mastered the first form.
---
*In the inner courtyard, Su Yao woke from a dream she couldn't remember. Her jade pendant was hot against her chest—hotter than it had ever been.*
*She sat up in bed, heart pounding.*
*"What are you?" she whispered, though she wasn't sure if she was asking the pendant or the man who had made it respond.*
*The pendant didn't answer. But it didn't cool down either.*
*She didn't sleep again that night.*