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For a list of all known monsters, see NPCs and Category:Characters.

Monsters are a very diverse race in Undertale. They dwell in the Underground beneath Mount Ebott, while humans and other races/species live on the surface beyond the Barrier. Every character encountered in the game besides the protagonist, the fallen human and Flowey is a monster.

Overview

King Asgore Dreemurr rules all monsters in the Underground. After The War of Humans and Monsters, monsters moved to the Underground from the Surface. Despite the negative implication of the word "monsters," monsters in Undertale are not an evil species. It is even said that monster SOULs are made of love, hope, and compassion.


"Love, hope, compassion... This is what people say monster SOULs are made of. But the absolute nature of "SOUL" is unknown. After all, humans have proven their SOULs don't need these things to exist." - Book 6 (from the left) in Snowdin Library"


Monsters are by far weaker than humans, both in physical combat and regarding the strength of their SOUL.Template:Quote''Humans are unbelievably strong. It would take the SOUL of nearly every monster... ... just to equal the power of a single human SOUL.''" - Ancient glyphs in Waterfall


"While monsters are mostly made of magic, human beings are mostly made of water. Humans, with their physical forms, are far stronger than us." - Book in Snowdin Library"


This inadequacy is because monsters are mostly made of magic, which in turn makes them attuned to their SOUL. The damage a monster receives from an attacker is dependent on both the monster's will to fight and the attacker's will to hurt.


""Because they are made of magic, monsters' bodies are attuned to their SOUL. If a monster doesn't want to fight, its defenses will weaken. And the crueller the intentions of our enemies, the more their attacks will hurt us. Therefore, if a being with a powerful SOUL struck with the desire to kill... Um, let's end the chapter here..." - Book in Snowdin Library"


Monsters, however, can obtain an "unfathomable" amount of power when they absorb the SOUL of a human.[1]

Physiology

Monsters come in numerous shapes and sizes, although the notable species of monsters include skeletons like Sans and Papyrus, ghosts like Napstablook and their relatives and Boss Monsters like Toriel and Asgore. Monsters SOULs are usually wholly white, with a couple of exceptions.[citation needed]

A monster's body is mostly made of magic and is attuned to its SOUL. When a monster gets old, they enter a state called "fallen down" A monster in this state lies immobile and turns to dust shortly afterward. When a monster dies, its body turns into dust. This dust is often spread onto the owner's favorite thing in funerals so that their essence lives on in their possessions. Monsters' bodies and SOULs are closely linked; when a monster dies, their SOUL is lost forever. Boss Monsters are an exception, as their SOULs exist outside their bodies for a few moments before shattering.

Because of their magical nature, monsters' bodies cannot handle high concentrations of determination. When monsters are injected with it, their bodies liquefy and melt together. The Amalgamates are a clear example of this.

Trivia

  • It is presumed that at least 322 monsters inhabit the Underground – given the number of monster souls visibly emanating from Asriel Dreemurr as the barrier is broken, plus incorporeal ghosts, who do not participate in the event. At least 104 monsters must be killed as part of fulfilling the requirements of the Genocide Route.
  • Boss Monsters are very likely the only kind of monster that can live eternally. Using ASGORE as an example, he fought in the war between humans and monsters and still lives many years later, existing when the first human fell and when the protagonist fell as well. An explanation for this can be found in one of Gerson's dialogues during the epilogue.
  1. "When a human dies, its soul remains stable outside the body. Meanwhile, a monster's soul disappears near-instantly upon death. This allows monsters to absorb the souls of humans... While it is extremely difficult for humans to absorb a monster's soul. This is why they feared us. Though monsters are weak, with enough human souls... They could easily destroy all of mankind." - Monster History part 7
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