The Fourth Book by Moyu De Xiaojue

Set in the world of Undertale. This is a fanfic I wrote myself. Updates are extremely slow, so proceed with caution. The rest is just filler.

Long, long ago, Earth was ruled by two races: humans and monsters.

One day, war broke out between the two races.

After a long war,

the humans emerged victorious.

They sealed the monsters underground with a magic spell.