Persuasion Stat.
On release, I think they're going to make it more clear by putting any other stat it uses next to the dialogue, like "[Intelligence] (dialogue)".
Or swap out Intelligence if it uses another stat. So then it depends on how high that stat of yours is, Like wit, strength, Constitution, etc etc. The normal Persuasion stat in Civil Abilities still plays a role and i think it adds up? Won't know for sure on release, but for EA, it's the Persuasion stat.