Oath Veil is an accessory that provides Magic Defense +60, and when one is consumed by a monster, it increases its Magic Defense by 1. It can be found at Bevelle Underground during Chapter 3 and 5, stolen from Machina Panzer or Adamantortoise (Oversoul), bribed from Guardian Beast (11,544 gil - x1) or Guardian Beast (Oversoul; 16,120 gil - x1, rarely x2), or as a random prize from winning the Cactuar Cup.