Reisen Riou spent his days hand-crafting One System, Ten Thousand Minds units. In Teyvat, otherworldly knowledge was both common and rare. Alchemy, a clear import, had spread long ago—its origins lost even to Celestia. Localized over time, it blended seamlessly with Teyvat's tech unless it touched taboo depths. One System, Ten Thousand Minds was similar: beyond its binary programming and design logic, it bore no trace of Reisen Riou's past-world roots, fully adapted with superior Inazuma techniques.
Today, the long-awaited live Pyro Regisvine arrived. Reisen Riou paused his work to meet the ship—a black vessel docking at a covert Arataki Coast port under a moonless night. "Why not Ritou's main harbor?" he grumbled.
"Costs Mora, my lord. We're not rich, and the Kanjou Commission would fleece us," the Northland Intelligence Organization's Inazuma branch leader replied.
Reisen Riou, no friend of the Kanjou Commission, let it slide. Inspecting the Pyro Regisvine, he noted minor damage but confirmed it was alive. He paid the balance and, on a whim, bought the alchemist's ley line vitality fluid formula—a Pyro-aligned liquid mimicking ley line energy. His own version cost 10,000 Mora per liter with weaker effects; this alchemist's was cheaper and better, undervalued by its creator. Reisen Riou knew better than to hog every advantage—some deals were too good to overengineer.
To everyone's shock, he hoisted the Pyro Regisvine onto his shoulder and walked off. "Which big shot is that?" the alchemist gasped.
"That's Reisen Riou, promoted from Fifth Scribe to Recorder a few years back. Never forget a major client," the branch leader said.
The alchemist swallowed hard. "You're saying he's a civilian official?"
"By rank, yes. Before the Shogunate, he worked at a shrine, not a samurai," the leader said, wiping cold sweat. "Blocking his path last time was reckless."
"Your intel's off," the alchemist muttered.
"We'll update it," the leader promised. "Pleasure doing business. Looking forward to the next two deliveries."
"Count on it," the alchemist said.
Reisen Riou hauled the Regisvine to a nearby village, commandeered a fishing boat with his authority, and sailed to Hanami Ward. There, he had a samurai return the boat while he carried the Regisvine to his estate under cover of night, stashing it in his cave heaven. He envied future Teyvat Travelers' ley line teleportation, imagining breakfast in Mondstadt, fish in Inazuma, meat in Sumeru, and Liyue snacks with tales of the Geo Archon. (PS: During the latest main quest, when the Traveler's locked in confinement, Nilou's perspective shows a blank map—no waypoints, statues, or domains. Probably a typical Vision holder's view.)
In the cave heaven's monster execution arena, brimming with ley line energy, the Pyro Regisvine regained vitality. Days earlier, Reisen Riou had prepared Pyro-infused fertile soil, enriched with crushed Twilight Lodestone for its base. "It loves it," he noted. "Once it heals, I'll start research. Can't wait."
He resumed crafting One System, Ten Thousand Minds. Over half the units were done, with an automated dyeing machine and fixative ready. A unit took five minutes on the assembly line, styled in regal purple with Electro Tri-Tomoe motifs, matching Inazuma's aesthetic. "Hm?" He paused, sensing Ei.
"Ei, what's up?" he asked as she appeared in the cave heaven.
"Tenryou samurai said you got a live Pyro Regisvine. I'm curious," Ei said. Inazuma lacked boss-tier monsters like Regisvines, though it had allied Electro Hypostases, obedient to top-tier Electro beings like Ei and Makoto. "Took Northland over a year. Common elsewhere, rare here. Don't kill it—I need it for research, and I can't afford another."
"Got it," Ei said.
"I'm just worried you'll slice it in a fit," he teased. "Look, touch, but no blades. I'm busy."
The next day, fertilizing the Regisvine, Reisen Riou stared at fist marks on its trunk. Still alive but wilted, it looked spooked.