Yeah, we're *specifically* wondering whether or not the Circlet of Persuasion works, which seems debatable, for some of the reasons mentioned in this thread. :)
It strikes me as odd that all charisma based casters could get a +3 to all their caster checks and ONLY charisma based casters could get this.
Just to clarify, this is *specfically* about the Circlet of Persuasion, giving its bonus to concentration checks. :)
