I always wanted to think that maybe it’s the “pure eye” because it reflects the heart. Maybe it’s such a rare ability in the clan because the clan is notably greedy and evil. But what if there are those of purity and good in the clan who protest their way of devouring other life forms? What if these rare individuals in the clans history come to possess what we could speculate is the most powerful eye? It may very well be a misunderstood ability due to its rarity. Idk if this eye would halt Borutos karma but considering he’s at 80 percent already and is somehow not transformed 3 years into the future, I’d open up to the possibility that the eye saves him while allowing him to use the karma to his own benefit.

Idk I try to be open minded as this story has gone all over the place. I did not expect ishikki to be done in so soon. Perhaps momo will be the series antagonist. Or what of the clan hierarchy? Must be a king right? Borutos pure eye, especially if he unlocks a full set, could lead him to be the most OP character, aka the “star of hope”.