Playing Rappelz, that you need to buy an Ethereal Restoration Stone from the Merchant. While if your equipment has broken from loss of durability you need to make sure you have a double of that item which is named wise, it doesn't have to have full durability, just as long as it is the same name.

Here we take an example for you, Assume that you have a Wicked Coralwood Staff and it's broken, that you need to get another Wicked Coralwood Staff to restore the durability and repair it. And here are the steps.
1) Open your Inventory then open up the Combination Window.
2) Place the broken item(Rappelz Rupees) you wish restored into the main slot of the combination window.
3) Place the Ethereal Restoration Stone in to the first slot of the second section.
4) Place the equipment which has the exact same name as the broken one in beside the Restoration Stone.
5) Combine.

Tip: You have not yet had to use a restoration stone as you haven't ever broken any equipment with durability as you keep an eye on it constantly, so you are only judging by the description it has given on the Restoration Stone on the merchant window.

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