Unflappable - you ignore the effects of disadvantage on charisma checks. (note that it does not say you cannot have disadvantage, but rather that you ignore its effects, one of which is the negation of advantage)
now you have a character who has +5 and advantage on all saves vs magic, regardless of any negative circumstances.
"Trying to run gritty gothic horror with 4e is like trying to cut down a tree with a hammer, likewise trying to run heroic fantasy with 1e is like trying to hammer a nail with a chainsaw."
This is what i get when i hit the Quote button: http://community.wizards.com/%23