@welcome2atlantis I remember that one JRPG I've accidentally found from some random Japanese blog site years and years ago where it had an item called Banshou
it was a scoop but on the category of swords and it's effect is basically (if I remember):
- low percentage of damage done with attack adds to own ATK stat. only during battles, resets after a battle
- high chance of "flat-lining" enemy's HP. (I remember that it said flat-lining in the description and it just basically a percent chance of insta-kill )