The monsters came

A loud shattering sound had come from Mount Ebbot. Billowing gusts of change swept through the neighboring town. Nobody knew what had just happened and how the work would drastically change. It was shortly after this that a hiker reported beasts, a large herd of them, marching down down the mountain. Few still believed the tales of monsters locked away in the Earth beneath everyone's feet. Yet more reports of the same came in, all getting closer and closer together. Finally, some cops were sent to monitor the bottom of the mountain, if only to appease the people. Sure enough, the monsters arrived.

The monsters came with a human child.

Young little Frisk had gone missing not too long ago. Nobody had any clue where they could've wandered off to. Search warrants and search parties were sent out to find the kid, but they were never found. The only people who had so much as seen them were reports around Mount Ebbot. People may not believe in monsters, but it held true that in this case what goes up doesn't come down. Until now. When the armed men saw Frisk surrounded by monsters, their first thought was that Frisk was a hostage. But the kid held onto the hand of a goat-like beast as if it was their own mother. The barricade of monsters wasn't threatening, but protecting.

The monsters came with a human child as their ambassador.

Most of the monsters eyed the military men suspiciously, specifically the weapons held in their white-knuckled hands. After a few moments of tense silence, Frisk stepped out of the safety that had been the middle of the group. A fish monster shifted a deadly looking spear as the humans lifted their guns just a little higher at the movement. The child was followed by a very big and very fluffy goat like monster with a rather kind smile on his face. On the other side, a grinning skeleton followed suit, seeming very cheerful, though he was fingering a blue bone nervously. Frisk introduces the self and the goat, who was apparently Asgore, King of the Monsters. Frisk explains that both they and the monsters mean no harm, that they will personally work as an ambassador. Thus began the long journey of figuring out how to make this work.