WARNING: THE FOLLOWING ADVICE IS ONLY FOR PEOPLE WHO KNOW WHAT THEY'RE DOING. IF YOU DON'T KNOW WHAT A HEX EDITOR IS OR CAN'T QUICKLY FIGURE OUT WHAT 4C IS IN BASE 10 THEN DO NOT ATTEMPT. ALSO MAKE SURE TO BACK UP YOUR SAVES.
So after extracting MobileObjects.save (using 7Zip) from a few save files and playing around in a hex editor I've figured out a way to fix the focus gain and the increased INT (which was definitely increasing status effect durations) from using the talisman (and probably the horn). Unfortunately the locations to edit will be different for every file, so I don't have any quick solution. Basically you want to look for the strings "FocusGainMult" and "IntellectBonus". It seems like the default focus gain hex values should be "00 00 80 3F" (this is what it's set to for a Cipher with no bonus and all other characters), but in my save after using the unconquerable talisman it was something like "5C 57 36 8A" (I forget exactly what it was). After taking the talisman off (and making sure I didn't have anything else giving an INT bonus) I edited the values in the "broken" save to be the default, put the altered MobileObjects.save file back into the save file, loaded the save and verified that I was able to gain focus in combat and that my Cipher had the correct INT value.
I haven't played at all after doing this fix, so it's still possible that the focus multiplier or INT bonus will get messed up again even without wearing the broken item. I also realized that Draining Whip might have a different FocusGainMult value, but haven't checked yet. In testing this all out I also noticed that another character had INT and PER values that were too high, but they were using different equipment that gave int bonuses (also in the Neck slot). Maybe there's just a general issue with bonuses from items in the neck slo
NOTE: I probably won't be checking this thread often (if at all), so don't wait for any answers from me if you have questions about editing your save.
