Description:
Developed in secret by The Lab. When used with a Photon Sphere, it boosts the Hit % of a weapon by 5%. (Weapon must have at least 5% Hit and cannot be boosted past 70%.)
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This item could drop on a few of the "weaker" IDs in some of the weaker areas. (Redria has fallen hard, for example.) The rarity should be set to the same level as that of 11-star weapons (1/28k from grunts and 1/12k from bigger enemies). That way, the item itself would be worth a lot. To farm enough of these to fully boost one weapon would take a tremendous commitment. (It would be essentially the same rarity as a J-Sword.)
Limiting the effectiveness of this item to 70% would still make the prospect of hunting for higher hit an endless endeavor. This would simply be a nice way to augment that process.
Edit: Also, the base item has to have Hit % to begin with, so this is an uphill battle on many fronts. It would also be a very difficult choice. "Do I use this on my 35 Hit HS or hold out for a better one to drop?" It's an exciting prospect.
Furthermore, the Sphere requirement would create another PD / Sphere sink which would offset some of the "event inflation," we've seen. An extra menu could be added to Paganini for this feature, similar to adding %s to weapons or specials to S-Ranks.
I'm sure
@XII would love to create some new text for Paganini after Lost Son Hopkins was removed
We could zoom in even closer to his face and have it say "You have done VERY WELL!" when boosting Hit %. xD
Edit 2: Change name of suggested item as "Precision Booster" would have been easily confused with both "PB" and "Photon Booster."
Crap...PC is confusing too.
Let's go with "Precision Enhancer."
Edit: Update due to a very good and constructive Discord conversation with Dab:
Item can only be used TWICE on any weapon and cannot boost the hit past 65 (rather than 70.) So if you find something with 50% hit and you manage to find two of this INSANELY RARE item, the best you can get is 60, for example. Is that better?
Another thing: Obviously cannot be used on S-Ranks, but CAN be used on enemy part weapons, effectively capping them at 60. And yes, Schtserv had a 60h Bringer's Rifle what was way less broken than other crazy crap they did.