This black silk robe is embroidered with adamantine thread in an elegant waterfall pattern.

An impervious vestment grants a +5 armor bonus to your Armor Class. This is a continuous effect and requires no activation.
In addition, you can command it once per day to create a blade barrier as a ringed wall of whirling blades only (20 feet high, up to 90 feet in diameter, centered on your current location). This effect lasts for 18 minutes or until dismissed as a standard action. As long as you wear the vestment, you can pass through your barrier without harm, though you receive no such protection against any other blade barrier.

Prerequisites: Craft Wondrous Item, blade barrier, mage armor.
Cost to Create: 17,000 gp, 1360 XP, 34 days.