undertale:downward fall(sans)

Description: (story):many years ago,a human fell down into the underground,they killed many of the monsters before they were confronted by sans and their soul was taken for the cause of all monsterkind, with the barrior broken and monsterkind free at least.one might ask what will happen now,well,this is where our story begins.........(sans ref):sans was the former brother of papyrus and the former assistant for gaster,gaster'gravitated' towards using a certain sheer amount of gravity to distort the barrier in such away that it no long sustained itself, and shattered. During one of his experiments,the core began to go into meltdown,and despite gaster stopping the meltdown at the cost of his life,sans was not so lucky,his soul was cracked,but his life was saved,but at a unknown cost