So one of the other attributes in my game is CHARISMA: each Avatar has his own level of charisma.
Now what I was thinking is that the charisma level could be used for diplomatic resolution of combat (territories). So basically you could have a card entitled "Peace Treaty" which resolves combat.
Aside from this, I have no other uses for CHARISMA.
Another possibility is cooperative play (for three or more players). Having a certain CHARISMA could allow you to forge an ALLIANCE with another player.