User blog:The True Transcendent/Death of a Demon

What do you think will happen if a Demon dies by unknown means? for example if Asuramaru/Kiseki-o/Raimeiki/Byakkomaru or even Mahiru-no-Yo (excluding Shikama Doji) were to die.

What will happen to them or what would happen with the cursed gear swords, would they probably break?