Missing mandible.
I believe when you have reached EX everything magic just can't harm you at all. Thus I think you should reduce teh effectiveness off any of your skills on an EX guy to 0%.
The Graviton family of magics are the equivalent of nukes in Elissa's AU. Even with the base version of the spell (Which can only really effect infantry and vehicles, lacking the necessary umph to damage buildings or destroy super heavies), I feel that it should be sufficiently powerful enough to crack the ribs and damage an organ or two for one that has EX Ranking.
Now, if you can nullify magic entirely, like the person Elf asked about, you get to sit there and laugh at me as I go off and sulk.