Doom & Demon Slayer: Kimetsu No Yaiba Xover

Chapter 47

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A portal spiralled to life within the open fields of Argent D'nur, allowing Tanjiro and the Doom Slayer to pass through seamlessly into the other world. The boy was fascinated by the sight of Argent D'nur, a place he's only ever heard of from the Doom Slayer. He was finally able to see it with his own eyes. Tanjiro was underwhelmed by how similar the terrain of Argent D'nur was to Earth, they were both identical so he didn't see anything that stood out to him but despite their similarities, something about the air and the essence of Argent D'nur's nature stood out to him but he couldn't quite put his finger on it. As Tanjiro looked around, he gasped once he saw a humongous megastructure in the far distance. It was a large, blue mountain of ice that pierced the sky and surpassed the atmosphere. His eyes widened, he has never seen something so large in his life. Despite being far away from it, the size of the mountain daunted him. It made him curious to know what type of creatures lived on it or what he would find if he hiked up it (if such a feat was possible).

The Slayer stepped forward without saying anything, prompting the boy to follow after him as they passed by countless trees. They followed along a streamlined path in the forest. There, they could see damaged vehicles and debris from the Argent D'nur civil war that took place many years ago. It seems that some of the damage has still not been repaired after all of this time. Tanjiro marvelled at the destroyed creations surrounding him. Despite their condition, they were designed so intricately that the boy couldn't comprehend the technology behind the broken war machines of the Night Sentinels. The more Tanjiro saw, the more the boy began recognizing consistent themes and patterns with Argent D'nur's technology. He was getting a strong imprint of the Night Sentinel's style and was better able to recognize their belongings if he saw it.

It didn't take them long to walk up to a Sentinel village which was still damaged from the civil war. However, it was surprisingly clean with no corpses in plain-sight or miniature debris. Tanjiro was surprised by the apparent lack of corpses. Sure, corpses decompose over time but he expected to find weapons and/or armor laying around. The boy accidentally bumped into the Slayer who had stopped in his tracks as he began looking around. The boy flinched upon bumping into the Slayer but frantically looked around once he noticed the Slayer doing the same.

"Took you longer than expected, Slayer." An older man's voice sounded from around a corner to a nearby building. Both Tanjiro and the Slayer looked towards the corner to see a battle-scarred Commander Valen emerging from the corner. The man walked towards the Doom Slayer with his argent hammer attached to the back of his suit, standing tall above the man's head. The man took notice of the surprised boy standing next to the Slayer and commented, "Ah, I understand. I was unaware you were bringing a companion with you."

Tanjiro composed himself as much as possible before the older man as he greeted himself quickly, "My name is Tanjiro Kamado, sir, it's a pleasure to meet you! Mister Flint has told me a lot about you!"

"Has he? Surprising. After becoming the Doom Slayer, he took up a vow of silence for reasons unknown. It seems things have changed since our last meeting." Valen then saw Xernex's argent axe hanging off of the Slayer's hip and noted, "I take it you finally put him down?" The Slayer didn't move his head due to it being a difficult question to answer. Xernex sacrificed himself by offering his power core to the Slayer so the warrior could return to his dimension and finish the fight. However, it was ultimately due to the Slayer's actions and the damage he inflicted on the night sentinel that his only friend finally passed away in battle.

After a brief pause, the warrior slowly nodded his head in response to the commander's question. The man let out a sigh as he placed his hand on the warrior's shoulder and consoled, "He won't be forgotten. Come, there is much to discuss." Valen guided the two of them to the same corner he emerged from to reveal a hidden manhole cover that led towards the sewer system of the village they were in. After removing the cover and descending the ladder, they began traversing the dark and eerie sewers of Argent D'nur. They traveled for several minutes, only following the former commander of the Night Sentinels in the darkness until they were taken to a large wall with a heavy blast door in the center. The man knocked on the door and said something in the sentinel language which the Slayer recognized. It was an old catchphrase Commander Valen would often say to his recruits. It roughly translates to: "Fight with honor, die with honor."