In the Forbidden Reach, you can loot various items profession items which you can work order or fix yourself if you have the right profession and recipe. For example, when you fix Damaged Trident, it turns into Ancient Ceremonial Trident.
When you are in the Forbidden Reach, you should get a star on your mini map that leads you to the location to put the item.
Every profession, both crafting and gathering has its own item that you can loot and either fix or work order to get the item.
The items when fixed are not soulbound, so you can also buy them on the AH.