You can create an invisible shell of air that grants you a +4 armor bonus.
Feats Compendium
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As a standard action, you can assume gaseous form (as the spell).
As a standard action, you can become invisible (as per the invisibility spell).
As a standard action, you can breathe a 30-foot line of electricity.
You gain resist electricity 5.
As a standard action, you can create a blast of air accompanied by a loud peal of thunder.
As a standard action, you can perform a melee touch attack that deals 1d6 points of electricity damage +1 point for every two oracle levels you possess.
Whenever you score a critical hit against an opponent with an attack spell, the target is staggered for 1 round.
You ignore penalties on Perception checks based on wind and the first 100 feet of distance.
As a swift action, you can manifest a pair of translucent, cloud-like wings that grant you a fly speed of 60 feet with good maneuverability.