In the first alpha build of the release, I plan to have a specialty class that is locked by default. All the other specs such as durability and power are unlocked but start at default. The way that these abilities are levelled up is correspondent to the nature of the abilities themselves. For instance, the power ability can be levelled up by fighting enemies and breaking entities. Your durability can be improved by being on good terms with the toolsmith.

Note that weapons will have a rarity value which will sometimes mean that they boost your stats / abilities by a given amount of levels. Note that this will not improve your base stats. Stats are only boosted when using the weapon.