@@irespectyouropinionhowever8652 I dunno. Maybe I thought it would be classified as one of those "Key item things that gets taken from your inventory going into NG+?
The buff the attack gives is actually useful. NG+ you can potentially run both light and dark and have a +20 holy damage buff and give enemies a debuff of -20 to holy negation.
First thing I thought of was shadow of the colossus. It legitimately seems like this weapon has zero lore in the game and is just there as a reference to shadow of the colossus and ICO