Ok so there isn’t actually evidence to support it, but hear me out
Since the Seven Eyed Sword is actually a Eight Eyed Sword.
We don’t really know how many eyes Kargob have.
All demon swords have edgy atributes (relentless omens, absolute fury, endless chaos…)
Kargob is the God of Darkness
Why do the Demon Swords hate Kargob so much? Why is He feared so much by the other Gods? Do humans worship other gods or maybe only Kargob is praised?
I think all those coincidences and “only Kargob” things may lead to Kargob formerly being a Demon Sword that changed it’s own nature.
Well, thanks for reading me!