The Old, Dusty Tome

by ApolloGeek27

In a lone corner, there laid a forgotten tome in the Snowdin Library. Here, scribed onto worn-out pages, are the secrets of the War. Here, dried ink and beautiful illustrations, tell the story of Monsters. Here, covered by the shadows of eras long pass, are the undiscovered mysteries of UNDERTALE. Part of the KeeperVerse.

4. Monster Aging

Monsters age differently than humans.

This is because they do not have physical matter.

Monsters are made from magic, which is an intangible substance.

Because of the magic they posses, they develop slower than humans.

50 years for a human would be 1 year for Monsters.

Monsters only tend to age rapidly when they have children.

A monster's child would steadily drain magic from their parents, making the monster parents age rapidly.

The child drains the magic in order to gain more substance for their physical form.

The child will only stop draining their parent's magic when they are at their prime.

Once at their prime, monster parents will resume their normal aging rate.