The primeval robe legs degrade to dust after 100,000 charges of combat, and cannot be repaired. Fighting in Raids does not degrade them at all. When wearing the full regular or Achto Primeval set, or a mix of the two, there is a 2% chance per piece that all of your defensive abilities will have their cooldowns reset. When this happens, there is a 1 minute cooldown before they can be reset again. Owning the primeval robe legs also doubles the chance of getting the Achto Primeval robe legs as a drop from one of the Raids bosses. If you die in the Wilderness with the primeval robe legs, it will drop instead of the item.