The teralith cuirass degrades to dust after 100,000 charges of combat, and cannot be repaired. Fighting in Raids does not degrade it at all. When wearing the full regular or Achto Teralith 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 teralith cuirass also doubles the chance of getting the Achto Teralith Cuirass as a drop from one of the Raids bosses. If you die in the Wilderness with the teralith cuirass, it will drop 6 million coins instead of the item.