"We came into the world like brother and brother; And now let's go hand in hand, not one before another." - by William Shakespeare.
As Unicron slumbered in his dormancy, he found himself to be in a blue sky and clouds. Looking around, he had the realization that he was in his brother's domain. While he wondered to himself in caution, a voice called from behind him.
Knowing in frustration, he turned to see his twin brother: Primus. He was as broad as himself, but he was much different. Primus's armor was round and colored with proud varying blue color schemes. Parts of his armor were gold like Unicron but with pureness in them. Unlike his stone-faced and bearded brother, his face was clean-shaven, smooth, and wizened with age. Primus had blue eyes. His knightly helmet sprouted small feathers from the sides. From his back were large metallic wings decorated with ornate sword-like feathers. Compared to his brother, who would be the devil, he would be the God of Light, leading his noble angels to protect the innocent.
Stepping forward and staring into Primus's pure blue eyes hatefully, Unicron asked if he was trying to settle the score with him. To his bafflement, Primus replied that he only wished to visit him, not fight him. Never in a millennium had he heard his old foe saying he brought the literal God of Chaos just for a conversation. Conversing with a previous god and Scientia was comforting, but talking to his opposite equal was another.
While he could wish he may have the strength to awaken his dormant body and destroy Primus himself, Unicron realized he might endanger Scientia. Calming himself, Unicron begrudgingly allowed Primus to voice his reasoning.
Beginning the conversation, Primus stated his awareness of Unicron's creation of his destructive artifacts and his silent quest for a champion to destroy him. He may not have been spying on his chaotic twin, but he could sense the dying life-force of previous Cybertronians who visited his earthly prison. He felt their suffering, which was brought upon by the weapons that consumed their Sparks, and he could feel their frames mutilated to the point of bare recognition. The sensation was harrowing for him to comprehend his brother's needless sense of violence.
Stating without remorse that they were necessary sacrifices, Unicron turned away from his brother. He was about to leave the astral plane when he heard Primus begging him to stop the cycle of hatred while he still could. Befitting his title as the God of Creation, he wanted the best for others, including his brother. Despite their years of conflict, Primus still cared for him. Not wanting to be caught off-guard, he tried to remind himself of who he was. Being the Chaos Bringer, his discovered purpose was to wreak destruction and death upon the galaxy. However, he never felt joy destroying planets and stars. He was the God of Chaos, an engine of nihilism that ensured anything trying to stop him was meaningless. He believed everything should perish and wither away. That was when it hit him.
Being a god, he could never die. Even if his Anti-Spark died out by his brother's hand, he would always rise again. He never needed sustenance, sleep, or energy to keep himself alive. If he destroyed everything, including the multiverse, victory would be pointless. There would be no foes to challenge, no obstacles to overcome, or worlds to eradicate. For him, it will be nothing more than a pyrrhic victory.
When Unicron realized fighting his brother may mean nothing, he turned back to face Primus. Since his defeat, they haven't spoken to one another for a long time. Hoping to hear his reasoning, Unicron inquired if Primus had companions to communicate with, supposing his reputation as the God of Creation would allow him a degree of favor.
To his surprise, Primus answered that he never had the same companionship as Unicron had. His only purpose was to sustain life on Cybertron. Even if he wished to create a manifestation to communicate with the populace, he wanted to let them be. Unicron dryly stated that it was ironic that the benevolent God of Creation had no companion to share the moment.
The statement he made hit him. Unicron remembered when he taught Scientia about different worlds and their cultures. Scientia educated him about what family and love were like in return for his teachings. The last thing he remembered was the kiss they shared in the sky. It was the first time he felt a warm feeling inside of himself. The realization hits him again, reminding the Chaos Bringer that he is not alone.
When Primus mentioned Scientia, Unicron was immediately reluctant to confide in him about her. When his brother asked him about his fondness for her, Unicron replied that she was interesting from his point of view. What made him fond of her was that she was the one who tempered his imperious attitude toward mortals.
Even though he was the Chaos Bringer, he would do so to keep the balance in check. Instead, he vowed to spend a millennium with her than fight his brother again.
Not wanting to endanger Scientia with the possibilities of warfare with Primus, Unicron chose to make peace with his nature and Primus. For his sake and Scientia's.
Before leaving Primus' astral plane, his heavenly brother wished him the best of luck and wellness. It was a sign that he made amends with Unicron mutually.
Unicron turned his head away but felt satisfied that his brother didn't oppose him. He just wanted to make amends as any sibling would.