Armor of Fallen Leaves

This enhancement can be woven into any armor, magical or mundane, wrapping it in enchanted autumn leaves of red, orange and yellow. This enhancement is permanent and can only be used once. This provides  +1 AC to said armor, even if it has already been magically imbued. 
As a bonus action the armor transforms you into a swirling cloud of leaves that allows you to move up to 30 feet to an unoccupied space you can see, moving through occupied spaces without interference and not provoking attacks of opportunity.
In addition, as an action you can transform into a swirling mass of leaves with the effect of the gaseous form spell. Once you use this feature you cannot use it again until the following dawn.