Leaving Lyra at Winterfell was the hardest choice Robin had made since arriving in Westeros.
Standing at the heavy oak gates of the Great Keep, eight-year-old Lyra clung tightly to his waist, her face buried against his leather riding tunic. But this time, she did not cry. Surrounded by six-year-old Sansa, who held her hand, and Lady Catelyn, who gently smoothed her dark hair, Lyra felt safe.
"I will be back before the first heavy snows, sweet sister," Robin promised softly, kneeling to kiss her forehead. "Stay close to Sansa, practice your sums with Maester Luwin, and don't let Robb trick you into tree-climbing."
"I won't," Lyra sniffled, offering a small, brave smile. "Bring me a piece of the ice wall, Robin."
"I shall," Robin smiled.
With twenty Sea Guards, fifty master masons, and thirty heavy supply wagons loaded with quicklime, volcanic ash, iron framing, double-paned glass, and thousands of sealed food jars, Robin turned his horse north. Beside him rode Jeor Mormont, draped in the heavy black wool and fur of a sworn brother of the Night's Watch.
The journey up the Kingstroad took twelve days, passing through the desolate, wind-swept expanse of the New Gift.
As they crested the final ridge of stunted pine and frozen mud, the world abruptly ended in a wall of blinding, monolithic white.
The Wall stretched from horizon to horizon—a seven-hundred-foot vertical precipice of ancient, compressed ice, glittering blue and dark white beneath the pale grey autumn sky. Nestled at its base, looking like a collection of crude wooden toys dropped into the snow, lay Castle Black.
It was far bleaker than Robin had anticipated.
Castle Black possessed no southern walls, only three crumbling stone keeps, half-ruined timber towers held together by rusted iron bands, and drafty, ice-encrusted barracks. Cold wind howled down the ice face, whistling through broken slate roofs and damp stone cellars.
As the supply caravan rumbled into the muddy courtyard, the black-clad brothers gathered in silent, sullen curiosity.
Bowen Marsh, the Lord Steward, squinted through the frost on his collar, his eyes widening at the endless line of heavy wagons. Beside him stood First Builder Othell Yarwyck, scratching his beard in disbelief.
"By the Old Gods," Othell muttered, staring at the crates of polished glass and bags of dark grey ash. "What in the Seven Kingdoms is all this?"
Jeor Mormont stepped down from his horse, pulling his black cloak tightly around his broad shoulders. "This, Builder Yarwyck, is our salvation. Lord Robin Flint has come to rebuild Castle Black."
Robin did not ask for a feast. He did not ask for a warm bath or a feather bed.
An hour after arriving, while the brothers of the Watch were still staring at the glass sheets, Robin stripped off his heavy velvet cloak, pulled on a durable leather work tunic, and rolled up his sleeves.
"Master Builder Yarwyck," Robin called out, stepping into the freezing courtyard with a heavy iron crowbar and a roll of surveyor's parchment. "Assemble your builders and masons. We burn no time."
Othell Yarwyck blinked, stunned to see a sixteen-year-old high lord—a boy whose name was whispered in King's Landing—standing in the freezing slush of Castle Black, preparing to do manual labor. "My Lord... the sun sets in two hours. Surely you wish to rest in the Lord Commander's tower?"
"The cold does not wait for sunset, Master Yarwyck," Robin replied calmly, his clear eyes sweeping over the crumbling foundations of the Hardin’s Tower and the Underground Wormways. "Neither do we."
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Within three hours, Robin had organized his fifty master masons and thirty sworn brothers into three distinct engineering divisions.
Robin’s M22 spatial awareness had already detected what centuries of neglected maintenance had hidden.
Deep beneath the granite bedrock of Castle Black—where ancient First Men had built the original foundations—sat a series of natural geothermal thermal vents. Over four hundred years, ice-melt runoff, coal soot, and collapsed masonry had choked the subterranean stone flues, trapping the heat deep underground while the castle above froze.
Robin led a pickaxe crew directly into the dark, pitch-black lower cellars beneath the Great Hall.
CLANG! SMASH!
Working alongside his men in the damp gloom, Robin swung a heavy iron sledgehammer with terrifying, tireless precision. Sweat glistened on his broad shoulders despite the freezing air as he shattered a two-foot wall of frozen ice and collapsed slate.
"Stand back!" Robin commanded.
With a loud, resounding CRACK, the final stone barrier gave way.
A rush of roaring, warm air hissed out of the dark fissure! Plumes of subterranean steam billowed into the dark cellar, instantly melting the ice on the stone walls and filling the damp room with the deep, thermal warmth of the earth's mantle.
Othell Yarwyck and Bowen Marsh, who had followed the digging crew down into the cellars, gasped as the freezing chill of the underground vault vanished, replaced by a warm, tropical draft.
"By the Smith's forge..." Yarwyck whispered, reaching out to touch the stone flues, which were rapidly heating up like hearth-stones. "The heat was sitting right beneath our boots all this time?!"
"It was buried beneath four centuries of neglect," Robin said, wiping soot from his brow, his breathing calm and steady. "Now, we channel it."
For seven days, Castle Black bore witness to an absolute miracle of engineering.
Robin worked endlessly. He was the first to rise before the cold dawn and the last to drop his tools at midnight. While older brothers of the Watch huddled around peat fires in their woolens, Robin stood in the mud, mixing pozzolanic marine concrete with seawater and crushed volcanic ash, pouring indestructible foundation footings for new barracks.
The Night's Watch watched in utter, breathless astonishment.
They saw a high lord of the realm, a boy who had sung before the King and defeated knights in the capital, knee-deep in grey mortar, hoisting heavy ironwood beams, guiding stone blocks into place with block-and-tackle winches, and personally testing the structural integrity of every archway.
"The boy isn't human," an old veteran crow muttered, watching Robin lift a two-hundred-pound iron support frame into place without so much as a grimace. "He moves like a mountain dwarf and builds like Bran the Builder himself!"
Using his poured concrete, Robin reinforced the crumbling bases of the King's Tower and Hardin's Tower, sealing them against frost wedging and drafty drafts. The subterranean Wormways—once terrifying, ice-choked tunnels where men froze in winter—were paved with smooth concrete floors and lined with warm geothermal heat-pipes.
The crowning achievement was completed on the ninth day.
Directly against the south-facing stone cliff below the high winch-cage, sitting right over the cleared geothermal vents, Robin erected The Wall’s Crystal Garden.
It was a massive, two-hundred-foot-long conservatory framed in dark, rust-proofed iron, enclosed by thick, double-paned glass panels. Hot steam from the subterranean flues was routed through iron pipes beneath the rich, dark soil beds inside the structure.
When the final glass pane was sealed into place, Jeor Mormont, Bowen Marsh, and two hundred black-clad brothers walked inside.
The moment they crossed the double-doored airlock, the freezing arctic wind vanished.
Inside, the air was hot, humid, and rich with the smell of sweet, damp earth. Sunlight streamed through the high glass panes, bouncing off the massive, glittering ice wall towering directly above. Row upon row of fresh winter squash, cabbages, dark rye, and red berries—planted by Robin’s agricultural specialists—were already sprouting in the warm, steamed soil.
Bowen Marsh slowly took off his thick leather gloves, staring at the green sprouts in absolute, stunned silence. Tears welled in the old Lord Steward's eyes as he reached down to touch a fresh green leaf.
"Fresh greens..." Bowen choked out, his voice trembling. "Fresh soup... in the middle of winter at Castle Black. We won't have to eat rotten salt-pork and sawdust gruel..."
Jeor Mormont stood beside Robin, looking up at the towering Wall, then at the glowing glass garden nestled at its roots.
The Old Bear placed a heavy, gauntleted hand on the sixteen-year-old’s shoulder, his hard eyes filled with a reverence that went beyond titles and lords.
"They call you the 'Singing Lord' in the south, Robin," Jeor said, his deep voice thick with emotion. "They call you an architect in Winterfell. But here... here at the edge of the world... you have given the Night's Watch life."
Robin looked out over the warm, green sanctuary, his M22 mind registering the stable internal temperature of seventy degrees while thirty-knot arctic winds battered the glass outside.
"The Wall shields the realm, Lord Mormont," Robin replied softly, offering a faint, quiet smile. "It is only right that the realm shields the Wall."