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(This is a Saga of Tanya the evil x Vinland Saga Fanfic: it's set in the vinland Saga world but the vinland Saga canon events and episodes rarely happens or maybe not who knows, but there will be characters from the vinland Saga world but their roles are minor, this is just a fanfic if a their values collides, about one being peace, redemption, and the cost of violence, while Tanya's journey interrogates their values, but through brutal inversion) 

A storm raged over the restless sea, lightning tearing the sky as if the gods themselves were tearing their wrath across the world. Below, on a jagged shore lined with ancient oaks and black stones, a figure stood unmoved—calm, resolute, and alien.

Tanya von Degurechaff, the Devil of Vinland, had come.

Her pale eyes scanned the horizon with cold calculation, a faint smirk curling on lips that had tasted both fire and blood. Behind her, the waves whispered secrets only she seemed to understand: the promise of conquest, the cruelty of survival, the inevitable clash between man and god.

This was no land for mercy or legends—it was a crucible. And Tanya was its fire.

As thunder echoed like the drums of war, the shadows of the old world stirred—warriors, gods, and madmen. Somewhere deep in the wilds, a mad scientist’s laughter echoed, twisted and gleeful.

The Iron Kingdom was not yet born. But it was coming.

(This Tanya is a little bit different from the Tanya we know as she/he has morals but still don't act on it and is a survivalist as we know, the different part is she/he is a little bit more human than the devil we know)

Ashes of Empire: The Devil of Vinland

It was a cold morning when Tanya stood atop the blackened ridgeline, her coat fluttering as steam curled from the mouths of men and beasts. The fires of the night's camp had long gone out, but a new flame—quieter, crueler—had taken root in the earth. Beneath her feet, in the ditches and grooves carved into the frost-bitten valley, the first deployment of Mayuri's newest invention was set.

"Ready to begin resonance field tests," Mayuri said without looking up, crouched beside an odd bronze-and-bone contraption. The thing hummed softly, low enough to feel in the bones. "I do hope your little cultists enjoy surprises."

"Test it on the scavengers from the eastern forest," Tanya said calmly, gesturing toward a band of raiders that had been spotted days ago. "They've been preying on my supply lines. No one will miss them."

"Ah," Mayuri smiled. "Perfect fodder."

The scavengers never knew what hit them.

At sunrise, the raiders crept into a gully near a farm Tanya's soldiers had deliberately left undefended. As they rushed forward to loot what they assumed was easy prey, the traps triggered. Metal rods anchored to the soil activated. A low-frequency sound, like the growl of the underworld itself, burst forth.

The effect was immediate—and horrific. Men clutched their ears, screamed, and vomited. Blood oozed from noses. Several dropped dead on the spot, skulls shaking as though rattled by unseen demons. Others tried to flee but collapsed into seizures.

Back on the ridge, Tanya observed through a brass eyeglass.

"Success," she muttered. "It works."

"Preliminary resonance," Mayuri clarified, scribbling notes furiously with one hand while fondling a shivering rat in his other. "Frequency variation at the lower bands causes disorientation, but if I increase pitch modulation..."

"Later," Tanya cut him off. "We've made our point."

She turned to Ivar, her newly promoted war captain, standing at ease in blood-speckled armor.

"Let the survivors crawl back to their kin. Let them speak of a scream from the gods."

The next day, Arnar's forces arrived.

Tanya met them openly in a controlled, secure camp. The men looked worn, still licking wounds from the civil strife that had consumed Sigmund's former domain. They marched under Arnar's banner, but Tanya's own cult symbols already adorned their shields—painted hastily in black and rust-red.

"I see you brought warriors instead of questions," Tanya said to Arnar, who bowed curtly.

"I bring both," he said, cautious. "Word spreads of magic and screams in the wind. Raiders fled into our territory raving about it. What have you unleashed?"

"A gift from the gods," she said, voice sweet as poison. "And a warning to those who steal from me."

Arnar studied her in silence, then slowly nodded. "So be it. We've buried enough brothers. I will not make more enemies of gods."

She saw the calculation in his eyes. He didn't believe—but he feared.

That night, Mayuri worked in his tent, giggling to himself as he sketched improvements.

Tanya entered, her presence casting a long shadow across the scattered tools.

"No more tests without my approval," she said firmly.

"Why?" Mayuri tilted his head. "We've barely scratched the surface. There's so much more to feel. To hear. To sing!"

Tanya placed a hand on his shoulder, squeezing just enough to elicit discomfort.

"Because now they believe," she whispered. "And belief is more valuable than blood."

Mayuri grinned, delighted. "Then we sing to their faith."

Tanya stepped outside into the cold night. From the distance, she could still hear the faint echo of the abyss.

Chapter 22 – "Echo of the Abyss"