The battlefield lay strewn with the detritus of war, a sombre testament to the cost of peace. Among the lifeless bodies and shattered remnants of dreams, a figure emerged from the shadows, his presence commanding and terrible. Vidar, the Forgotten Son of Asgard, stood before the assembled Avengers and a weeping Thor, his gaze fixed on the lifeless body of his brother, Loki.

Loki's death at the hands of Thanos had sent Vidar into a rage untold, a depth of fury unseen in the universe. The air around him crackled with an unspoken power, his anger palpable yet contained beneath his stoic exterior. As he approached, the Avengers watched in tense silence, the atmosphere thick with the anticipation of what was to come.

Thor knelt beside Loki's corpse, tears streaming down his face. His grief was a raw, open wound, and he looked up as Vidar approached, his expression a mix of sorrow and dread. Vidar's eyes, however, held only cold determination as they locked onto Thor's.

"Vidar," Thor's voice was hoarse with anguish, "Loki... he's gone."

Vidar's gaze never wavered from Loki's lifeless form. His heart ached with a pain so profound it threatened to consume him, but he did not allow his stoic facade to falter. He knelt beside Loki, his fingers gently brushing the cold skin of his brother's face.

"Loki," Vidar murmured, his voice a quiet storm. "I failed you."

The Avengers watched, their own grief momentarily eclipsed by the raw intensity of Vidar's presence. Thanos had retreated, but the threat of his return loomed like a dark cloud over their victory. Vidar's anger, however, was a force unto itself, promising retribution beyond imagining.

Thor began again, his voice trembling. "We... we must avenge him."

Vidar's eyes finally lifted to meet Thor's. The look he gave Thor was one of utter distaste and hatred, so intense that Thor visibly shivered under his gaze. "Avenge?" he repeated, his voice carrying the weight of his fury. "You speak of vengeance as if it is a mere task. You know nothing of the depths of my rage, Thor."

Thor flinched at the coldness in Vidar's tone. "I know he was your brother. I know—"

"You know nothing!" Vidar's voice was a thunderclap, silencing Thor. "Loki was more than my brother. He was the only family I had left, the only one who understood the pain of being cast aside, of being used."

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Vidar's mind reeled with memories, each one a sharp blade that cut deeper into his heart. He remembered Loki's mischievous grin, the spark of defiance in his eyes, and the countless times he had been unjustly punished by Odin's sons. Thor, the favored one, who had always received their father's praise, while Loki had been scorned and belittled. Vidar's hatred for Thor had grown with every slight, every injustice that had been heaped upon his brother.

The Avengers stood silent, their faces a mixture of shock and indifference. To them, Loki had been an enemy, a villain who had caused them great suffering. They could not comprehend the depth of Vidar's grief, the burning rage that consumed him.

When Steve Rogers stepped forward, trying to bridge the gap, Vidar dismissed him with a cold glance. "You are leeches and parasites," Vidar said, his voice dripping with contempt. "Betrayers and hypocrites, all of you. You are no better than Thanos in my eyes."

The Avengers recoiled at the venom in his words, but Vidar cared not. His sole focus was on Loki. Carefully, he lifted his brother's body and placed it into a casket he conjured from the very essence of reality, a vessel worthy of a prince.

As Vidar prepared to leave, he reached out with his hand and tore apart the fabric of space itself, leaving a scar in reality. It was a message, a warning to all who conspired with Thanos: they would cease to exist under his wrath. The tear shimmered ominously, a testament to his unbridled power and his unyielding resolve.

Thor tried once more, his voice breaking. "Vidar, please—"

Vidar's glare cut him off, colder than the void of space. "Do not speak to me of brotherhood, Thor. You are nothing to me."

With a final, disdainful look at the Avengers, Vidar stepped through the tear in reality, disappearing into the cosmos. His hunt for Thanos had begun, and woe betide any who stood in his path. The Forgotten Son of Asgard was now a force unleashed, his wrath a storm that would sweep through the universe, leaving only silence in its wake.

Vidar's quest for vengeance was not just for Loki, but for every moment of pain and betrayal. His was a crusade of retribution, fuelled by a brother's love and an unquenchable rage. And as he tore through the realms, his name would become a whisper of terror, a reminder that even the gods could fall.