From DDO wiki
Durability is a reference number given to an item in-game that gives the player a value for how much damage an item can take before it breaks.
- Worn / damaged items have a chance to take permanent damage equal to the amount of wear / damage.
- You may reduce your chance for permanent damage by taking your equipment to an apprentice or expert repair location. Details on repair can be found on the equipment repair page.
- Bound items never take permanent damage. You may eliminate the chance to take permanent damage by performing the binding and attuning ritual at a Stone of Change.
- Only an Item Restoration Oil from the DDO Store can repair items that have permanent damage. However, you can perform adamantine rituals to increase the overall durability and even make items that are "Broken Beyond Repair" usable again.