This is a short cut scenes from the story
are the leader of the Royal guards who fought with human many many years ago. However, they lost in the battle and sealed in to the underground by the powerful humans.
They were living peacefully and met human name Frisk. Everybody were became too contended to the underground, but King Asgore asked Dr.Alphys to do some experiment..the experiment was combining monsters to the energy called “ Determination.” They were desperate to gain new power..they wonder if it’s safe monsters to gain such energy.
Alphys was desperate to do anything just for the King’s request. However, dead body of monsters are really fragile..they just melt and couldn’t stand the force of determination.
Alphys needs to cope up with another plan and she calculated that monster with strong will can bare the force of determination. She was blind with her ideas and desires..she asked Crusher to help her experiment. Since, Crusher is the member of great Royal guard who fought from the war many years ago. She said that Crusher’s body can handle it.
Alphys promised Crusher that just a pinch of his arm is good enough, but it was really a lie. Until Hunter was really worried that he’s brother still not home yet.
So,Hunter went to the lab to see his brother…and he sees nothing..
just the dead body of Crusher in the end.