When you upgrade/enchant something, the durability of an item will go down.
So the higher the dura of an item is, the more times you can upgrade/enchant it.
If it goes down too low, the item will be destroyed; "break".
When you use a Cube, which will de-enchant an enchantment level, it will give back 1-5 durability.
Cubes are pretty much useless though, it won't get rid of the enchant completely since there aren't any Lv0 Cubes.
Sorry If I kinda went off the topic of dura. :v
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