For Guardians, This is sold by Quartermaster Ciaba of The Storm Inquisition in Sanctum of the Vigil of Sanctum. She is in the north room of the ground floor.
For Defiant, this Recipe is located in the College of Planar Studies, down the stairs to your right as you enter from The Manufactory. First NPC on the right. Bolorma Pavro of Zephyrian Collective in Meridian.
Requires Decorated Notoriety and 200 Planarite