Using a hammer of pure materials, one may invoke the Foundation. The purer the materials used, the better, both for the hammer and the project undertaken with the hammer.

The first step is acquiring the hammer. The second is acquiring the materials. The third step is always the checking of the materials. A good craftsman always checks his tools and materials before beginning work. The fourth step is getting organized, as one would normally do for a project, and the fifth step is to imagine what one wishes to craft.

Then, one must begin work immediately. If the project is big, then resting is allowed, but other than stopping for natural breaks, any distraction will only flaw the process. One must work single-mindedly upon the project until completion, and then, if one has been true and used strong materials, the power of Foundation will resonate with the results.

A hammer used in such a process will gain certain properties, giving bonuses to similar work in the future. A hammer used in carpentry will have +1 carpentry from then on, in smithing +1 to smithing, etc. All such tools will, if used against morags or hexars, have a further +3/+3 vs. those creatures. The bonuses to crafting continue the more the hammer is used, maxing out at +9. The bonus against destroyers will never go above +3/+3.

The more things made with the hammer after that, especially of pure materials, the stronger the hammer will become. In game terms, every project will add points to the hammer. A complicated project seen through will max out at +6 on its own. If it is done entirely with pure materials, a further +3 will be added. These are simply a way of keeping score, and not a reflection of the hammer's bonuses (which max out at +9). At 100 points, the hammer transforms.

However, because of the intensity of the practice, if one keeps working with the hammer over and over again, they risk burning out the hammer or themselves. Rest periods between projects depend upon the complexity of the previous project and the nature of the user, anywhere between a week to a century. Because of the power of the Foundation, those more attuned to it (shemir, aldar) must rest longer between projects, because it affects them more strongly. Those more opposed to it (trolls) must also rest longer between projects, because it harms them. Those with a moderate distance from it (dwarves, for instance) are best suited to recovery.

A transformed hammer, called Aedificarium Malleus, becomes made of raw Foundational energy. It will be useful for one more project, for which it will, in game terms, simply be narrated by the user (within reason). After this final project, the Aedificarium Malleus will be merge with the user, giving them a permanent skill boost.