The basis of the foot is the construction with 3 layers of wood that absorb most of the mechanical energies. Inside Tungsten for example, a mixture of Silver, Stainless Steel, Tungsten, Copper, Magnesium, Zinc, Steel and Ceramics are used to convert mechanical energy into heat. This mixture of metals and minerals also creates a magnetic field around each Magma that positively affects electronics.
3 Magmas are usually basic. But since you get different results depending on how many you use, you have to experiment if you want to maximise the results.
These can also be placed under Olympus and Poseidon earth boxes.