When and why did monsters leave the Ruins?



Once upon a time, Asriel lived with his mother and father in Home, and all monsters lived in the Ruins

But then…something happened.

Monsters lived in the Ruins, and their capital was Home.



But then, for reasons we’re never told, they became less afraid of humans, and decided to settle the rest of the underground.

The calendars in Home and New Home imply the Dreemurrs moved from the old capital to the new one over the course of a single year. The year of 201X.



And they acquired a second child.

Most assume that this line means the date they fell into the Underground.



But what if they’re referring to the date they came to live in New Home?

