When a God of Destruction Was Reincarnated in Tensura:

After collecting his thoughts, Rimuru reached for the ring that connected him to Guy Crimson. The cool metal of the ring felt heavier in his grasp than usual, the weight of what he was about to do pressing down on him. He activated the ring, and it shimmered faintly as it established a connection.

"Guy," Rimuru said, his voice firm but urgent. "I need to see you right now. It's extremely important."

Guy's voice came through almost immediately, smooth and laced with curiosity. "Rimuru? What's with the sudden call? Don't tell me Milim broke something important again."

"Not the time for jokes, Guy," Rimuru snapped. "This is serious. It's about the survival of the world. I'm coming to your castle now."

There was a brief silence before Guy replied, his tone losing its usual playful edge. "Alright. Come over. I'll be waiting."

Without wasting a second, Rimuru activated Spatial Motion and vanished from his chamber, reappearing moments later at the grand entrance of Guy Crimson's castle. The icy winds of the Frozen Continent whipped around him, but Rimuru paid them no mind. The towering, dark castle loomed before him, its crimson-tinted windows glowing faintly in the frigid night.

The massive doors of the castle swung open as Rimuru approached, as though Guy had anticipated his arrival. He stepped inside, greeted by the grand hall's familiar red-and-black motif, the aura of power that emanated from every corner unmistakable.

Guy sat casually on his throne, his crimson eyes glinting as he rested his chin on one hand. Beside him stood his two aides, Mecha and Gord, their expressions calm but attentive.

"Rimuru," Guy said, his usual smirk plastered on his face. "For you to come all the way here in such a hurry, this must be something big. What's going on?"

"It is," Rimuru replied, his tone leaving no room for banter. "I need to tell you something I just learned from Beerus."

That name alone made Guy's smirk falter. His expression became serious, and he motioned for Rimuru to continue. "Alright, you've got my attention. What did Beerus say?"

Rimuru recounted everything Beerus had told him: the existence of Artemis Valtheron, the being of destruction sealed by Veldanava, his ideology of perfection through rebirth, and how the seal had weakened since Veldanava's death. He explained the dire consequences of Artemis breaking free and how Beerus had chosen not to intervene, leaving the task to the Demon Lords and the world's inhabitants.

By the time Rimuru finished, the room was heavy with tension. Mecha and Gord exchanged uneasy glances, while Guy sat in silence, his crimson eyes narrowed in thought.

"So," Guy finally said, his voice low, "this Artemis Valtheron… a being so dangerous that even Veldanava couldn't kill him. And now the seal is about to break." He leaned back in his throne, tapping his fingers against the armrest. "This isn't just a threat—it's a catastrophe waiting to happen."

"Exactly," Rimuru said. "That's why I came to you first. We need to act now. We can't wait for the seal to break before we start preparing."

Guy's gaze sharpened. "And you're here because you want me to call for a Walpurgis, right?"

Rimuru nodded. "Yes. We need to get all the Demon Lords together. Everyone needs to understand the gravity of the situation. After that, we'll need to contact the leaders of the other nations and coordinate our efforts. This isn't just a fight for the Demon Lords—it's a fight for the entire world."

Guy chuckled, though there was little humor in it. "A Walpurgis, huh? You don't ask for small favors, do you, Rimuru? Getting the Demon Lords to cooperate is like herding cats—arrogant, extremely powerful cats."

"I know," Rimuru said, his voice firm. "But we don't have a choice. If we don't unite now, we're all doomed. Artemis won't spare anyone, not Demon Lords, not humans, not monsters. Everything will be destroyed."

Guy sighed and ran a hand through his crimson hair. "Alright, fine. I'll call for a Walpurgis. But you'd better be ready to explain all of this to the others. Some of them aren't going to take this seriously, and you know it."

"I'll make them take it seriously," Rimuru said, his determination clear. "If they don't understand the threat, I'll make them understand."

Mecha stepped forward, her voice calm but firm. "If this Artemis Valtheron is truly as powerful as you say, shouldn't we also start preparing our forces now? Waiting for the Walpurgis might cost us valuable time."

"He's right," Gord added. "Even with all the Demon Lords united, it might not be enough. We should start strengthening our defenses and gathering allies immediately."

Rimuru nodded. "I agree. While we're organizing the Walpurgis, I'll start reaching out to the other nations. Dwargon, Thalion, the Beast Kingdom, the Western Nations—they all need to be informed. This isn't a fight we can win alone."

Guy smirked, his usual confidence returning. "Alright, Rimuru. I'll do my part and get the Walpurgis set up. But don't think for a second I'm doing this because I'm scared of some ancient god of destruction. If anything, I'm looking forward to seeing just how strong this Artemis guy really is."

Rimuru sighed. "You're impossible, Guy."

Guy's smirk widened. "And you wouldn't have it any other way."

With Guy's agreement, the first step in Rimuru's plan was complete. The Walpurgis would be called, and the Demon Lords would be gathered to discuss the impending threat. But Rimuru knew this was only the beginning. Convincing the Demon Lords to unite was one thing—getting them to cooperate in a coordinated defense was another matter entirely.

As Rimuru prepared to leave, he turned back to Guy one last time. "Thanks for this. I'll be in touch soon with more details."

Guy waved him off. "Just don't make me regret helping you. And Rimuru—don't get yourself killed before the real fight starts. That would be boring."

With that, Rimuru activated Spatial Motion and returned to Tempest, his mind already racing with the next steps. The clock was ticking, and Artemis Valtheron's awakening loomed ever closer. There was no room for hesitation now—Rimuru had to unite the world before it was too late.

After Rimuru disappeared, the grand hall of Guy Crimson's castle fell into a tense silence. Guy remained seated on his throne, his crimson eyes fixed on the floor, deep in thought. The weight of Rimuru's warning hung over him like a dark cloud. If Artemis Valtheron was truly as powerful as Beerus claimed, then even uniting every force in the world might not be enough.

"This isn't just some passing threat," Guy muttered under his breath. "This is the end of everything as we know it, unless we find a way to stop it."

Straightening up, Guy called out, "Mecha. Gord."

In a flash, his two current aides kneeled before him. Mecha, sleek and intimidating in her black, armor-like attire, radiated precision and control. Beside her, Gord, a towering figure with golden eyes and an aura of raw, destructive power, stood at attention. Both knelt before their master, awaiting his orders.

"Listen closely," Guy said, his voice cold and commanding. "Go to every single Demon Lord. Inform them that I am calling for a Walpurgis two days from now. No absences will be tolerated. If they hesitate, drag them here. If they resist, I don't care how much damage you cause—bring them anyway."

Mecha and Gord exchanged glances, then bowed deeply. "Understood, Lord Guy," they said in unison before vanishing into the ether, their speed leaving the air around them rippling.

Left alone, Guy leaned back in his throne, staring up at the vaulted ceiling. His mind raced. The situation was worse than anything he had ever dealt with, and the responsibility of holding the world together weighed heavily on him.

"If Beerus is right," he muttered, "then even with all the Demon Lords united, we're no match for Artemis Valtheron. That means only one thing: we all need to get stronger. And fast."

The thought stirred something deep within him. For centuries, Guy had ruled as the strongest Demon Lord, content in his dominance. But now, that complacency would no longer suffice. The Mediator of the world could not afford to sit idly by.

He stood, his crimson hair flowing behind him like liquid fire. His gaze was sharp and full of resolve.

"Mecha. Gord. Rimuru. Every Demon Lord, every nation—none of them are ready for this," he said to himself. "If Artemis is truly destruction incarnate, then I'll have to become something greater."

Guy began pacing the hall, his mind racing with possibilities. How could he grow stronger when he had already ascended to the level of a True Demon Lord? The thought seemed impossible—yet he refused to accept that.

"Every power has its limits," he murmured, "but only if you let it. There's always another level. If I can't find it, I'll make it myself."

He summoned ancient texts from deep within the castle's archives, tomes that had been untouched for millennia. They floated around him, their pages flipping rapidly as he scanned for forgotten knowledge—anything that could give him an edge. Forbidden techniques, ancient rituals, untapped sources of power—Guy would stop at nothing.

As he delved into the depths of his research, one thought lingered in his mind: even with his strength, this might not be enough.

"Rimuru was right to warn me," Guy said quietly. "But now, it's my responsibility to ensure this world survives. I'll drag the Demon Lords into line, and I'll push myself to heights even I didn't think possible."

Meanwhile, Mecha and Gord were already spreading the word to the other Demon Lords. The announcement of an emergency Walpurgis, called by Guy Crimson himself, sent shockwaves through the ranks of the Demon Lords. Some would grumble, others would resist—but none could ignore the summons of the Mediator.

Back at the castle, Guy stood at the top of his throne room, looking out over the endless expanse of snow and ice that surrounded his domain. The biting wind whipped through his hair, but he barely noticed. His mind was focused entirely on the challenge ahead.

"This world is mine to protect," Guy said to himself, his crimson eyes burning with determination. "And no so-called god of destruction is going to take it from me. If Artemis wants destruction, I'll show him what true power looks like."

With that, he turned and descended back into his castle, ready to face whatever challenges lay ahead. In two days' time, the Walpurgis would take place—and the stage for the greatest battle in history would begin to take shape.