Renzo sat on a flat rock, his stomach letting out a long, low growl that sounded suspiciously like a protest.
"Okay, okay, I hear you," he muttered, rubbing his belly.
He looked at his North Face bag.
It was mostly empty now.
He had his laptop (a heavy paperweight), his scientific calculator, his metal ruler, and the Iron-Scaled Bolo he'd earned from the mound-landlord.
Food was the problem.
He had the "Heart-Berries" the leaf-eared kitten gave him, but those were sweet.
His body was craving something hot, something salty, something that felt like a real meal.
"To cook, I need a stove," Renzo said, standing up.
"I can't just keep throwing wood into a hole in the dirt.
It's inefficient.
The heat escapes, the wind blows the sparks toward my bed, and it uses too much fuel."
He looked at the ground.
The mud here was strange — it was silver and thick, like melted lead.
When he stepped in it, it felt squishy, but after an hour in the sun, it turned hard and crumbly like old biscuits.
"It's not strong enough on its own," Renzo noted, poking a dried clump with his finger.
"If I build a stove out of just this mud, the first time the fire gets hot, the walls will crack and collapse. It needs a 'skeleton'."
This was his first real Brain Challenge.
Back at NEUST, he'd studied how concrete works.
You don't just use cement; you put steel bars inside it.
The steel handles the pulling (tension) and the concrete handles the crushing (compression).
"I don't have steel," Renzo looked around the clearing. "But I have the Sun-Forged Kawayan."
He spent the next two hours working.
His hands were starting to get calloused, and his back ached, but he didn't stop.
He used his bolo to split a thick bamboo stalk into thin, flexible strips.
Then, he started weaving.
He wasn't a weaver, but he knew Geometry. He made a small, circular basket with a hole at the bottom for the air and a hole at the top for the smoke.
"Step one: The Frame. Completed," he puffed, wiping sweat from his forehead with his arm.
Now came the messy part.
He went down to the stream and scooped up armfuls of the silver mud.
He dragged it back to his hut and started mixing it with dry, chopped-up grass and the hairy fibers from the bark of a nearby tree.
"The grass is my rebar," he explained to a curious dragonfly.
"It holds the mud together so it doesn't fall apart when it dries."
He began smearing the mud over his bamboo basket.
It was exhausting work. The mud was heavy and sticky, and it kept sliding off.
He had to wait for one layer to get "tacky" before adding the next.
PING!
[CONSTRUCTION PROGRESS: 40%]
[Warning: Structural Instability detected. Add more 'Binder'.]
"I'm trying, I'm trying!" Renzo snapped at the screen.
He realized the mud was drying too fast on the outside while staying wet on the inside.
This was a classic engineering mistake.
If the outside dries first, it shrinks and cracks.
"I need to slow it down," he thought.
He grabbed some large, waxy leaves from a fern and wrapped them around his half-finished stove.
This kept the moisture in, letting the whole thing dry at the same speed.
It took hours.
By the time the lavender sun was halfway down the sky, Renzo was covered in silver muck from head to toe.
He looked like a statue that had come to life.
But standing in front of his hut was a solid, three-legged silver stove.
It wasn't pretty, but it was stable.
"Now for the test," he whispered.
He put some dry shavings inside and struck a match. He held his breath.
If he'd messed up the air-flow, the fire would just choke and die.
Fwoosh.
The flames caught.
Because of the way he'd shaped the inside— narrowing at the top like a chimney — the fire didn't just burn; it roared.
The heat was concentrated in one spot, right where he could put a pot.
"I did it," he laughed, feeling a rush of pride that was better than any grade he'd ever received.
"It's a rocket stove. Low fuel, high heat."
He took a thick section of green bamboo —one he'd cut fresh so it wouldn't burn — and filled it with silver water.
He placed it on top of his new stove.
In less than five minutes, the water was boiling.
He didn't have any fancy noodles or crackers left.
All he had was a handful of "Heart-Berries."
He took the fruit, mashed them with his ruler, and dropped them into the boiling water.
The steam that rose up wasn't just sweet; it smelled hearty, like a warm soup.
He sat by his glowing silver stove, sipping the hot fruit-broth from a bamboo cup.
It wasn't a burger. It wasn't a feast.
But it was hot, and he had built the machine that made it.
"Rule number two," Renzo said, his eyes reflecting the violet flames.
"If the world doesn't give you a tool, you make one."
He leaned back against the tree root, feeling the warmth of the stove on his face.
He was tired, he was dirty, and he was far from home. But for the first time, the forest didn't feel like a trap.
It felt like a Project.
And Renzo was the lead engineer.