Talk:Boss Monster/@comment-27975634-20160321224820/@comment-24939728-20160327054635

And technically, it isn't her soul that persists, it's her entire form. If you remember when you kill both Toriel and Asgore in either a neutral or genocide route, their souls linger for a moment before actually shattering.

Undyne's soul, on the other hand, is not even shown when her body fades, thus proving that she is not a boss monster.