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When your Intelligence Score changes permanently, such as from an Ability Score Increase, an equipped Magic Item, or permanent Ability Score Damage, you may gain or lose the following:
Note that if you already have a positive modifier, and that modifier is reduced (for example, from a +4 to a +3), you will lose the extra languages/proficiency that would have been gained by having the higher modifier.
Rolling a Natural 20 automatically succeeds.
Once per session at any time (where it makes sense to), a player can say “I know a guy” and quickly sketch out an NPC and their relationship to that character. Then the player must make a Charisma roll to see how well that NPC reacts to the situation/request.