I just came up with a new AU:
UNDERTALE: Humanitys Downfall
Heres the once upon a time sequence:
A Long time ago two races ruled over the earth Humans and Monsters!
But those days are far gone...
Humanity Sealed Monsters underground for eons the Biggest Mistake we ever made!
Because one day the prince of Monsters: Asriel Dreemur came to reclaim the Monsters Freedom...
He Took 6 Lives and freed Monsterkind but we Didnt Accept this Murderer another Big mistake...
We Tried to strike him down with everything we got...
He Survived...
And than as if he waited for that to happen he declared war on Humanity and strengthend Monsterkind...
For the Monsters he became their Great King for us he became the God Of Death!
Now we live in fear in bunkers deep Underground fearful of further attacks and we are the Lucky ones...
Here are the Main Characters:
Frisk: A Young Human Trying to set things right by venturing outside of Bunker 10
Flowey: A Helpful Flower Monster has Amnesia and is one of the last Pure Monsters!
Goreto Dreemur: Second Biological Child of Toriel and Asgore Guardian of the Human Ruins!
Papyrus: Human Rights Activist and Guardian of the Showdout Plains!
Sans: sans.
Undyne: General of the Army Of Monsters dissatisfied wit her lot in life Guardian of The Niagoro Falls!
Alphys: Mad Scientist tries to find Ways To Strengthen Monsters Guardian of Mt.Ebott!
Asriel Dreemur: GOHD Great King of Monsters seems to have it out for Humanity!