Talk:Sans VS Bill Cipher/@comment-26865490-20160221190013/@comment-665531-20160313030258

Bill is a Dream Demon, and has the ability to enter peoples' minds. As it turns out, destroying a mind while he's in it will take him out. That said, this seems to require a third party and a very fast destruction process.

A less obvious weakness is magic. Bill has been shown to have trouble penetrating magical shields, both artificial and natural. This would likely include the one above the Underground for example. And energy/magic-based attacks seem to at least have some effect on him, albeit nothing he can't regenerate.

Bill is also a bit inept at moving and dodging in a physical form. Possibly because he is unused to having one. He is also unused to feeling physical pain, meaning he has trouble rolling with punches. And hilariously, his eye is a weak spot. You'd think he'd learn to cover it.

Last, he seems to really dislike synthesized music. That probably doesn't matter, but if the fourth wall is broken during a point where Megalovania is playing, that'd probably distract him.

That said, I have no idea how Sans would pull off a win.