In some dialogues u get different options and/ or abilities with diferent things.
An example for charisma is in the fighter stronghold. IN one of the quests u have to pay a lot of money to some people, but if u have high charisma (i think about 16+) then u can get away with paying the partial amount.
As for the manual niot saying anything about it, 1.It has alot of errors 2. It does say that charisma affects morale- if the party leader has a high charisma, then morale failure has less chances of occuring
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