The day the human fell and was welcome with open arms by the Royal Family, the Underground was full of hope. Monsters believe that, if this one human child could accept monsters, who was to say other humans wouldn't do the same? Everyone lived in peace... Until the human fell ill. The kingdom was worried, Toriel and Asgore looked to each other for support. The human could not be cured of whatever illness that had befallen them.
Asriel never left their bedside. He remained there on his knees next to the bed, clinging to the human's hand as tears fell down his face.
"Chara... I... I don't like this plan anymore..."
"Y-You crybaby... Wh-Why aren't you happy? You... You're going to be free... All of you..."
After several days... The human died. Asriel absorbed the remaining Soul, becoming a God among Monsterkind. Toriel and Asgore begged Asriel to remain, but he carried Chara's body through the barrier. Asgore drew Toriel away from the Barrier, bringing her to the throne room as they waited in a tense silence for their son to return. What was only a few minutes felt like hours before Asriel stumbled into the room, still carrying the human's body. Asgore watched in horror while Toriel darted forward, both watching as Asriel stumbled to his knees in the center of the garden. Dropping Chara's body, the Monster prince crumbled to dust.
"Asriel!" Toriel cried, falling to her knees next to the garden.
"No..." Asgore murmured softly, his hands trembling slightly.
The King and Queen, as well as the rest of the Underground, mourned the loss of the Royal Children for a day, the kingdom seeming to be covered in a dark cloud. The humans had taken away any chance for peace with Asriel's death.
When he next addressed the kingdom, Asgore declared war on humanity. Any human that fell from then on would be killed, their Soul taken so the Monsters could break the Barrier. The Underground became full of hope again. All were happy... Except one.
"One of our children was human! How could you turn your back on them?" Toriel snapped during her argument with Asgore, after they returned to their room shortly after the declaration.
"Tori..." Asgore started weakly, holding out his hands.
"Do not 'Tori' me, Asgore! If you can so easily forget Chara was human-"
"What do you expect me to do, Tori?" Asgore asked.
"Withdraw this pointless declaration of war! It will not do any good for us or the humans!"
"Tori, I can't-" Asgore broke off, ducking under a fireball that came his way. Toriel turned, leaving their bedroom. Asgore let her go, giving her time to calm herself down. Slipping the crown off his head, the King of the Underground sat on the edge of the bed. After staring at the crown for a moment, he bowed his head. The crown slipped from is grasp, clattering to the floor as Asgore began to sob.
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As Toriel left the castle, her gaze drifted toward where Chara's casket lay. Walking down the stairway, she let out a faint sigh. "You should not be laid to rest in such a dreary place..." Removing the human's body, she turned and walked back up the stairwell. With what had once been her child in her arms, she headed toward the Ruins; though careful to keep herself from being seen.
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When Asgore awoke the next morning, Toriel had still not returned home. Concerned, he sent out a search of the entire Underground to try and find her. She was nowhere to be found, and no one had seen her since Asgore's declaration of war. Toriel had vanished.
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As Toriel walked past the basement stairs, her steps slowed. Taking a deep breath to steel herself, she continued into the living room. She wasn't going to return to that pathetic excuse of a Monster. He could not be forgiven for this decision. She did not care about him anymore; she did not need him. And she would tell herself this lie until she believed it.
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Asgore fiddled with his cape, straightening it out. His children had died, his wife had disappeared, his life had collapsed around him... But he must continue on. No matter how much despair he felt. Asgore picked up the discarded frown on the floor and placed it on his head. Straightening his back, he left the bedroom.
He did not want this so-called 'war' with humanity. He didn't want to hurt any other human that would fall. But it would make the kingdom happy. It would give them hope.
As King of the Underground, he could not let them down.
