"The great war of MONSTERS and HUMANS nearly wiped us from the planet. So many lives were taken, so many innocents lost. We were forced to surrender. Surrender our dignity, surrender our freedom. We were sealed away, never to see the sun again. Generations passed, but we did our best to maintain hope. To build a life for monsterkind in this underground hell. Yet, one day, in the year 201X, a glimmer of hope shone forth. A human fell from the light. This human showed kindness and compassion, something we once thought their species to be incapable of. With them, the future of MONSTERS grew ever brighter...
Until the human fell down.
Until both them and one of our princes were taken from us.
Our king, ASGORE, was overthrown and banished to The Old Lands. And now, we WILL reach the sun...
No matter what we must sacrifice."