Board Thread:General Discussion/@comment-26849575-20160315015552/@comment-25181180-20160410023307

In the Genocide Route, we slain all of the monsters, meaning that we just absorbed pretty much all of the monsters' soul. Frisk has an abnormal level of determination (as seen in Asriel's fight), and Chara used it as her trump card when possesing Frisk's body. In the end of the Genocide Route, Chara simply suck all of our power and determination, thus leaving Frisk as a weak, miserable SOUL. Using that enormous power, Chara destroyed the world and kills the defenseless Frisk in a single devastating blow.

There you go, the Genocide Route ending in a paragraph.