Long ago, two races ruled over the Earth as equals: humans and monsters. One day, a war broke out between them and after a long series of battles, the humans were victorious. The greatest of their magicians sealed the monsters to the Underground with a magic barrier, while the humans took control of the surface. However, the barrier is not a perfect seal, and the only point of entrance to the Underground is Mount Ebott.

Many years after the war, a human child falls through Mount Ebott and into the Ruins — a small section of the Underground. Though the protagonist is initially unmentioned throughout most of the game, later dialogue reveals the name as Frisk. They soon encounter Flowey, a sentient flower who attempts to kill Frisk for hisown amusement. Flowey is stopped by a motherly monster named Toriel, who teaches the child how to solve puzzles and survive conflict in the Underground. After a boss fight with Toriel, she allows Frisk to exit the ruins.

Frisk ventures through the Underground in order to reach the barrier located in the castle of Asgore Dreemurr, the king of the monsters. They learn that the king needs seven human souls to destroy the barrier and free the monsters - of which he has six. Throughout the game, they meet and fight many monsters, in which they may try to kill or to end the fight peacefully. Among the monsters that the player encounters are Sans, a wisecracking and slothful skeleton; Papyrus, Sans' enthusiastic yet incompetent brother; Undyne, the boisterous head of the royal guard; Mettaton, the death robot with dreams of super-stardom; and Alphys, the kingdom's royal scientist.The choices that the player makes determine the route that they take through the story, as well as the ending sequence.

If the player does a mixture of sparing and killing monsters (such as sparing major characters but killing random encounters), Alphys reveals that in order to cross the barrier, they also need a monster soul, meaning they must kill Asgore. Even if the player decides to spare Asgore, he will still die, as Flowey appears to kill him instead, then takes the form of a monstrous abomination that the player must then defeat.

If the player chooses to spare every encounter in the game and befriend key characters, the player learns that Flowey is the deceased son of Asgore and Toriel - Asriel, inadvertently revived as a result of Alphys attempting to give the will to live to a vessel with no soul. If the player chooses to kill every monster in the game, a separate entity known as 'Chara' slowly begins to assert their control over Frisk, awakened by the player's violence.

Further playthroughs are irreversibly affected by all routes, with differences in dialogue dependent on the decisions made in all previous playthroughs; the most significant change comes following the All-kills Route, in which Chara speaks to the player through the fourth wall and demands their soul in order to reset the world that they destroyed. Following the player's acceptance, Chara makes several appearances in later playthroughs and this change can only be reversed by editing the game files.

Oz№-4 | 3-UnderTale

[Temmie Rank 1] [Frisk and Toriel Rank 2] [Sans Rank 3][Papyrus Rank 4][Muffet Rank 5][Undyne Rank 6][Lesser Dog Rank 7]

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