The battlefield lay silent, the weight of their victory against Thanos settling heavily on the Avengers. Each member of the team dealt with their own grief and exhaustion, but the arrival of Vidar shattered any hope of solace.

Thor was the first to see him. He froze, the sight of Vidar's cold, imposing figure filling him with dread. "Vidar," Thor called out, trying to mask his unease. "Brother, please—"

Vidar's look of utter disdain and hatred silenced him instantly. The rest of the Avengers, unsure of who this new threat was, instinctively moved into defensive positions.

Tony Stark's faceplate lowered, his suit's systems readying for a potential fight. "Who the hell is this guy?" he muttered, his eyes narrowing.

Steve Rogers, ever the diplomat, stepped forward, his shield at the ready. "Vidar, we're on your side. We fought Thanos too. We all lost people we care about."

Vidar's gaze swept over the Avengers, his eyes cold and calculating. "You are nothing but parasites and hypocrites," he said, his voice dripping with contempt. "You claim to fight for justice, but you are blind to your own failings."

Natasha Romanoff stepped forward cautiously. "We don't know you, but we understand loss. Help us understand why you're here."

Vidar ignored her, his attention solely on Loki's lifeless form. Gently, he lifted Loki's body, placing it into a casket he conjured from the very essence of reality. The Avengers watched in stunned silence, unsure of how to respond to this display of power.

Thor attempted to speak again, his voice breaking. "Vidar, please. Let us work together—"

Vidar's glare cut him off, colder than the void of space. "You are no brother of mine, Thor. You and Odin are nothing but betrayers."

With a single gesture, Vidar tore apart the fabric of space, leaving a scar in reality. "This is a message," he said, his voice echoing with authority. "To all who conspired with Thanos: you will cease to exist."

And with that, he stepped through the tear, disappearing into the cosmos. The Avengers stood in stunned silence, the reality of what they had just witnessed sinking in.

-- The Aftermath of Thanos and Loki's Death

**Thor:**

Thor stood in silence, his heart heavy with grief and guilt. He had lost his brother, and now Vidar's searing hatred had left him feeling more alone than ever. He thought of Loki's mischievous smile, their shared moments of mischief and conflict, and how he had failed him.

"I couldn't save him," Thor whispered, his voice breaking. "I couldn't save either of them."

**Tony Stark:**

Tony was deeply unsettled by Vidar's appearance and power. Used to facing extraordinary threats, he recognized that Vidar was something entirely different. He couldn't shake the feeling of dread that Vidar's presence had left behind.

"We need to be ready," Tony said, his voice determined. "Vidar's a wildcard. We need new defenses, new tech. Something to keep us safe if he turns on us."

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**Steve Rogers:**

Steve felt a profound sense of empathy for Vidar's pain but also a deep concern about his unchecked power. He knew they had to be prepared for the possibility that Vidar might see them as enemies, despite their shared goal of avenging those lost to Thanos.

"We have to understand him," Steve said quietly, looking at his team. "If we can reach him, maybe we can prevent more bloodshed."

**Natasha Romanoff:**

Natasha, ever pragmatic, saw the potential threat Vidar posed. She started gathering intelligence, trying to understand Vidar's history and motivations better. She believed that knowledge might be their only advantage should Vidar's wrath ever turn towards Earth.

"We need to know everything about him," Natasha said, her voice firm. "His past, his weaknesses. Anything that could give us an edge."

**Bruce Banner:**

Bruce, torn between his scientist and warrior personas, found himself both fascinated and terrified by Vidar. He delved into Asgardian lore, hoping to uncover anything that might help them understand Vidar's capabilities and possibly find a way to neutralize them if necessary.

"Vidar's power... it's beyond anything we've seen," Bruce said, his mind racing with possibilities. "We need to understand the source of his strength."

**Clint Barton:**

Clint, the most grounded of the group, felt the weight of the new reality they faced. He resolved to protect his family and friends from any fallout that might come from their encounter with Vidar, preparing for the worst.

"I'm not letting my family get caught in this," Clint said quietly. "We need to prepare for whatever comes next."

-- The Hunt Begins

Vidar's journey through the cosmos was fueled by a singular purpose: vengeance. The universe trembled as he pursued Thanos's remaining allies and conspirators, leaving a trail of destruction in his wake. His name became a whisper of terror, a reminder that even the gods could fall to his wrath.

Each planet he visited bore witness to his power. Vidar tore through defenses, massacred armies, and left nothing but silence and desolation. His rage was unyielding, his resolve unbroken. The memory of Loki, the pain of betrayal, and the desire for retribution drove him forward.

In his quest, Vidar encountered allies and enemies, beings of great power who either sought to aid him or stop him. But none could stand against his fury. The universe watched in awe and fear as Vidar, the Forgotten Son of Asgard, carved his path of vengeance across the stars.

And so, the legend of Vidar grew, a tale of a brother's love and unquenchable rage. A force unleashed, a storm that swept through the cosmos, leaving only silence in its wake. Vidar's hunt for Thanos would become the stuff of myth, a testament to the unbreakable bond between brothers and the unstoppable power of vengeance.