The barrier preventing monsters from returning to the surface was broken. Yet a fail-safe was placed to ensure that the humans would never see them again. New creatures appear in a cave in the Everfree, and nopony is prepared for their new visitors.
The adventure begins, with us waking up in a pastel colored, pony inhabited world, and I meet the most pecilular ponies in a small town with a castle nearby, Who am I, I Am Sans the Skeleton...
When the mad tyrant attempts to siege the crystal city, one pony held him at bay. The only distinguishing features of this stallion were his blue hoodie and his large smile.
It'd been years. Years since the war. Steve was the only one left. Everyone else was gone. He lived, he fought. Rinse, repeat. All he wants is a second chance. And now, he'll get his chance.