This silk robe roils with the colors of storm clouds, constantly shifting in shade and hue.

While you wear a robe of thunder, you take only half damage from sonic attacks.
If such an attack allows a save for half damage, you instead take no damage with a successful save. This is a continuous effect and requires no activation.
When activated, a robe of thunder surrounds you in an invisible, faintly rumbling aura of thunder that lasts for 5 rounds (Listen DC 10 to hear the aura).
This aura deals 2d6 points of sonic damage to any creature striking you with a natural attack or nonreach melee weapon. This ability functions three times per day.
A druid benefits from wearing this item and can activate it even while in wild shape.

Prerequisites: Craft Wondrous Item, control weather, possession of a piece of the set.
Cost to Create: 19,000 gp, 1520 XP, 38 days.