Chapter 11: The Blood-Leaf Indicator and the Sulfur Vein

“Show me the water,” Inori said simply, stepping past the murmuring crowd.

Head Villager Silas gave a reluctant nod, gesturing for Tobias to lead the way. Takuya and Kaguya fell into step right behind Inori, their eyes scanning the village layout as they moved toward the northern fields.

As they walked past a small, fenced-in garden, Inori’s eyes snagged on a patch of broad, densely packed vegetables. The leaves were a deep, vibrant purplish-red. He stopped, pointing at the dirt.

“Tobias, what is that plant?” Inori asked, keeping his tone light.

“That? We call it Blood-leaf,” the young farmer replied, looking confused. “It’s a tough root vegetable. We chop it up for stews. Why?”

“I need three heads of it. And a metal pot with boiling water. Bring it to the field,” Inori instructed smoothly.

Silas frowned. “You said you were going to fix the crops, not make a soup.”

“It’s not for eating, Silas. It’s for seeing what cannot be seen,” Inori replied with a reassuring smile.

Internally, however, Inori’s mind was rapidly breaking down the molecular structure of the vegetable. Red cabbage equivalent, he thought, a familiar thrill of chemistry washing over him. The deep purple-red coloration is derived from water-soluble vacuolar pigments called anthocyanins. Specifically, the flavin molecule. Anthocyanin is a natural halochromic chemical compound. When introduced to a solution, the hydrogen ions (H+) in an acid or the hydroxide ions (OH-) in a base will physically alter the shape of the anthocyanin molecule, changing how it absorbs light. It is a perfect, naturally occurring pH indicator.

They reached the northern fields a few minutes later.

Inori crouched beside the irrigation trench that fed the rows of struggling wheat. The visual data was catastrophic.

Classic severe chlorosis, Inori analyzed silently. The older leaves are turning pale yellow while the veins remain green—a textbook nitrogen deficiency. Furthermore, the undersides of the leaves show distinct dark purple tinting. That’s anthocyanin buildup due to extreme phosphorus deficiency. The soil isn’t empty; it’s locked.

While Silas and Tobias hurried to set up a small firepit and a suspended iron pot filled with the “Blood-leaf,” Inori traced the irrigation trench backward. It connected directly to a slow-moving offshoot of the main river they had seen from the ridge. He cupped his hands, dipping them into the water, and brought it to his nose. It had a faint, sharp, almost metallic tang.

He returned to the group just as the water in the pot reached a rolling boil. The liquid rapidly turned a deep, inky purple as the anthocyanin leached from the boiling leaves.

“Take the leaves out. Leave the purple water,” Inori instructed.

He gathered a handful of soil from the roots of the sickest wheat plants and dropped it into a clean wooden bowl. He added a splash of pure drinking water from his canteen to create a muddy slurry.

“Watch closely,” Inori told the gathered villagers, keeping his voice gentle and dramatic.

He took a wooden ladle, scooped up the dark purple cabbage water, and poured it directly into the muddy soil slurry. Instantly, the purple liquid violently shifted color, turning into a bright, harsh, neon pinkish-red.

The villagers gasped, taking a step back. Tobias’s eyes went wide. “What… what did you do to it? Is it poisoned?”

“It is not poison for us, Tobias, but it is poison for the dirt,” Inori explained simply. “Your water has become too sour. Like a bad lemon. When the dirt gets too sour, the plants’ roots close up. They starve to death, even though there is food right next to them.”

Internally, Inori ran the complex reality: The color shift indicates a pH level below 4.5. Highly acidic. The acidity increases the solubility of toxic elements like aluminum and manganese in the soil, which scorch the roots. Meanwhile, the essential macronutrients—nitrogen, phosphorus, and potassium—become chemically bound to the soil particles or precipitate out into insoluble compounds. The plants are literally starving to death in a buffet line.

“If the water is poisoned, why aren’t we sick?” Silas demanded, eyeing the trench fearfully. “My people drink from the wells connected to this river.”

“Because a human stomach is already a pot of sour acid,” Inori smiled, using a simple analogy. “It helps us digest meat. Drinking this water just tastes a little tart to us. But a plant’s roots are delicate. If they drink sour water every day for weeks, they burn.”

Silas stared at the bright red mud. “Can you fix it?”

“Yes,” Inori nodded confidently. “Tobias, I need you to gather a specific kind of rock. It is usually white or pale grey. If you scratch it with a harder rock, it leaves a white powder. It doesn’t have a strong smell, maybe just a bit dusty, like crushed seashells. You can usually find it where the river cuts deep into the banks, or where old water pools have dried up.”

“Bone-stone,” Tobias recognized the description immediately. “There is a whole cliff of it half a mile down the dry creek bed.”

“Perfect,” Inori said. “Gather as much as you can. We need to crush it into a very fine powder. Then, we are going to mix that white powder deeply into the top dirt of your entire field.”

The chemical mechanics are foolproof, Inori thought. The “bone-stone” is limestone, primarily composed of calcium carbonate. By crushing it, we increase the surface area for the chemical reaction. When calcium carbonate mixes with the highly acidic soil, it reacts with the free hydrogen ions to produce calcium, water, and carbon dioxide gas. It will neutralize the acid and immediately buffer the soil pH back to a healthy 6.5, unlocking the trapped nitrogen and phosphorus.

While Tobias and several other desperate farmers ran to gather and crush the limestone, Inori turned his attention upstream. “Takuya, Kaguya. The soil fix is temporary. The river is the source. I need to find out why it suddenly turned acidic.”

The brothers walked up the riverbank, following the slow-moving current away from the village. About a mile upstream, the terrain shifted into steep, rocky hills.

Inori stopped, pointing to a massive scar on the hillside. A recent, minor landslide had torn away the topsoil, sending a massive pile of boulders and debris crashing directly into the river’s flow.

Inori scrambled up the rocks, inspecting the freshly exposed stone face. The rock was brittle, yellowish-grey, and had a distinct, faint smell.

“Rotten eggs,” Takuya noted, covering his nose.

Inori placed a hand over his mouth to hide the massive, manic grin spreading across his face.

Iron pyrite and elemental sulfur, Inori’s mind raced with absolute joy. The landslide exposed a massive sulfur vein to the air and the flowing river water. The sulfur is oxidizing, reacting with the water and oxygen to create sulfuric acid. It’s a natural acid mine drainage event. But more importantly… it’s a raw sulfur deposit! I have the foundational pillar of industrial chemistry! Gunpowder, vulcanized rubber, sulfuric acid manufacturing… I hold the keys to the industrial revolution in my bare hands.

He forced his expression back to calm professionalism and slid down the rocks to his brothers.

“The rock up there is souring the water,” Inori switched to their rapid, technical speech. “It’s a massive sulfur deposit leaching sulfuric acid into the current. We cannot manually excavate a vein of this volume without heavy machinery.”

“If we cannot remove the contaminant, we remove the vehicle,” Takuya replied instantly, analyzing the topography. “We reroute the river.”

Takuya walked back down to the village with a commanding stride. The villagers had already begun returning with carts full of crushed white limestone. Inori stayed behind to instruct them on how to till it evenly into the soil.

Takuya approached Head Villager Silas, who was watching the limestone application with nervous hope.

“Silas,” Takuya spoke with clear, unquestionable authority. “We found the problem. A landslide upstream dumped bad rocks into the water. We cannot move the rocks. So, we are going to move the river.”

Silas gaped at him. “Move a river? That takes months! We are just simple farmers.”

“You are going to do it in two days,” Takuya stated. “Gather every able-bodied man, every shovel, and every pickaxe. I will show you exactly what to do.”

Takuya’s architectural genius took over. He wasn’t just a politician; he was a master of civil planning. He drew a large map in the dirt square, gathering the men around him.

“Listen to me carefully,” Takuya ordered, his voice carrying the weight of a seasoned commander.

• Step 1: The Dry Dig. “We do not dig into the water first. We dig a new, curved trench right next to the river, bypassing the bad rocks. We leave a thick wall of dirt at the top and the bottom so the water doesn’t rush in while we work. You dig until the new path is deeper than the current riverbed.”

• Step 2: The Coffer Dam. “While they dig, I need a team cutting timber and gathering heavy clay. We are going to build a temporary wall—a dam—right above the bad rocks. We drive the timber into the riverbed and pack it with clay to block the water from hitting the landslide.”

• Step 3: The Breach. “Once the new path is deep enough, and the banks are lined with heavy stones to stop the mud from washing away, we break the dirt walls. Bottom wall first, then the top wall. The water will naturally flow into the new, deeper trench.”

The villagers stared at the complex, flawlessly logical plan drawn in the dirt. It wasn’t magic; it was just hard work organized by a brilliant mind.

“Do it,” Silas ordered his men.

The village sprang into action. For the rest of the day, Takuya orchestrated the labor with ruthless efficiency, identifying bottlenecks and reassigning weary workers. By the time the sun dipped below the horizon, painting the sky in deep purples, the first phase of the dry dig was already well underway.

Silas walked up to Takuya, wiping sweat from his brow. The suspicion in his eyes had significantly thawed. “You push my men hard, Takuya. But I have never seen them work with such purpose. You know what you are doing.”

“A good plan makes the work lighter, Silas,” Takuya smiled wearily.

“The inn is far from the northern fields,” Silas noted, looking at the exhausted brothers. “There is an old, abandoned farmer’s house just past the trench. The roof sags and the wood is rotting, but it has walls, and it is close to the worksite. You can sleep there temporarily tonight.”

“We appreciate it. We are very tired,” Takuya accepted gratefully.

The brothers made their way to the abandoned structure. Silas wasn’t lying; the house was barely standing. The thatched roof was partially caved in, and the floorboards groaned under their boots.

“Structural integrity is compromised,” Kaguya noted, tapping a rotting support beam. “But the load-bearing walls appear stable enough for a windless night.”

“Look out back,” Inori said, pushing open a creaky back door. “There’s a stone well.”

It was exactly what they needed. After days of sweating in the jungle, running from predators, and digging in the dirt, the prospect of clean water was heavenly. Taking turns, the brothers drew heavy buckets of cold water from the well, stripping off their ruined modern clothes to wash the grime, sweat, and dried mud from their bodies. The cold water shocked their exhausted muscles, but it felt incredibly revitalizing.

They slept on the dusty floorboards of the abandoned house, too tired to care about the lack of beds.

The next morning, they split up to maximize efficiency. Takuya returned straight to the riverbank, commanding the timber crews and overseeing the construction of the clay-packed coffer dam. Meanwhile, Inori and Kaguya headed to the fields. Inori meticulously managed the limestone tilling, ensuring the pH buffering would be even, while Kaguya acted as the camp medic, treating severe blisters, strained muscles, and minor cuts sustained by the desperate, overworked farmers.

By the afternoon of the second day, Takuya stood on the riverbank, raising his hand. The dry trench was complete.

“Breach the upper wall!” Takuya shouted.

Tobias and Vane swung their heavy pickaxes into the final plug of dirt. The earth gave way. With a rushing, thunderous roar, the clear water surged into the newly dug channel, completely bypassing the sulfur-tainted landslide and flowing smoothly back toward the village.

A loud, triumphant cheer erupted from the exhausted, mud-covered villagers. They had moved a river.

That evening, the atmosphere in Dian Village had entirely shifted. The suspicious glares were gone, replaced by awe and deep respect.

Head Villager Silas approached the brothers in the center square. He carried a large bundle in his arms.

“I have lived a long time,” Silas said, his raspy voice full of emotion. “I have never seen men work the earth and water like you three. The water in the irrigation trench is already running clear.”

“The soil will take two to three days to settle,” Inori explained gently. “But you will see the wheat turn green again very soon. The roots are finally able to eat.”

Silas nodded, handing the bundle to Takuya. “As agreed. We have prepared the best room in Elara’s inn for you. We will feed you for as long as you need. And here are three sets of woven clothes and sturdy leather boots. They are simple, but they are clean.”

“Thank you, Silas,” Takuya smiled, accepting the bundle. “You have a strong village. You just needed a little direction.”

As the villagers celebrated, the three brothers retreated to their room at the inn. They stripped off their ruined, alien business suits once and for all, trading them for the rough, practical tunics and trousers of the primitive world.

“Phase One is complete,” Takuya said, tightening his leather belt. “We have secured shelter, sustenance, and local trust. And we’ve gained access to a massive sulfur deposit.”

“The sociological baseline is established,” Kaguya noted, looking out the wooden window at the celebrating village. “This settlement is highly responsive to technological leverage.”

“Then we stay here for a while,” Takuya decided, a sharp, visionary gleam in his eyes. “We learn their laws, their trade routes, and their weaknesses. We will turn Dian Village into our first industrial stronghold.”