[@Foster] banned for mentioning the secrete cow stage. Also she didnt die. Just as diablo's soul stone was destroyed in hell forge and look who showed up in diablo three. You can kill the physical forms however all the evil leaves a back door open for their return. That is why good and evil will be an eternal cycle. 
[img]https://i.pinimg.com/originals/8d/5d/4b/8d5d4b10dd5ebd8f36f13aa4045c2719.jpg[/img]