Hey, guys!! welcome to this new and in progress AU!
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This is The Intro of Understart, enjoy!
In this AU we can give an answer to the unknown of
"what would happen if Chara would have affection toward the monsters and would live quietly with Asriel, Toriel and Asgore?"
well ..Asriel and Chara grow and at the same time their parents, the kings Asgore and toriel are starting to be more older; Asgore dies apparently for unknown reasons. Toriel is saw depressed by this gave the throne to the two successors, Asriel and Chara, Toriel goes to the ruins and she pass a time there, to test the independence of her sons and their responsibility to handle the reins of the kingdom.
Chara after a while, begins to remember the hate she/he had to humans, sharing the throne with Asriel, was the perfect opportunity for barely out of the Underground, for kill every human who would find in her/his way... What did Chara?. The first step was the enact a new law on the backs of Asriel, was decreed that: -- all human that will come to the underground should be murdered and give the human soul to Chara -- .
The monsters were not in accordance with this law, since they only wanted peace between the two species, Chara needed 6 human souls for get all of the kingdom out of the underground, but to the see the "rebellion" of all the monsters , only began to feel more and more hate; Chara was losing the determination slowly, , becoming the worst monster of all, in her/his soul don't had love, only was pure hate , as consequence of the same, tried to kill Asriel, Who just opened the eyes of it really was his brother/sister, he decided to run and scape to the ruins before be murdered, giving the news to Toriel; she was going to do something for the Kingdom, but when Asriel tells to her what became Chara. They block the pass to the underground by the door of the basement of their home, but unfortunately, all of the humans who came to the ruins, found to get out and be murdered for the royal guard or Chara. All monsters except who live in the ruins are under the total domination of Chara. Each monster should "try" to kill all humans and give their souls to Chara. . After the hate took over her / him, it was necessary 7 human souls for destroy the barrier