User blog comment:Rafe Adler/"The Big Empty" Discussion/@comment-3045936-20171104030324/@comment-2003:C2:ABD7:CE00:5173:FDEE:ED02:347A-20171104182430

"The Empty" in Supernatural isn't an actual nothingness. Nothingness refers to the absence of any property (except this property). The Empty we saw in SPN had plenty of properties, it is not an actual nothingness. In "true nothingness" there is no space, no time, no physical or spiritual, certainly no entities, just not a thing. That's what Amara was referring to. So if God or Amara would die, the Empty would cease to exist as well and turn into true nothingness.