Harmonic Copper

Harmonic copper is what makes up the vast majority of solid mass in the plane of Mechanus. Its "raw" state is clockwork mechanism, formed into perfect harmony by the will of Primus. Getting some of this material out of this plane, and reforming it into something else is exceedingly difficult. Gnomes, particularly rock gnomes, covet this metal above all others, and it is said that their primary deity Garl Glittergold was the first outsider of Mechanus to learn how to use the stuff, techniques that he taught to his children. The exact method of smelting this metal is mostly lost, though it is known that it involves having it reach a specific temperature (within one hundredth of a degree) for a specifc duration of time (within one hundredth of a second).

Harmonic copper has the following properties:

• A clockwork device made of harmonic copper, wound only once, never needs to be rewound again, continuing to tick endlessly.

• While the material itself isn't magically sturdy, a mechanism made of harmonic copper is: such a mechanism has resistance to all damage and has an armor class of 20.

• A weapon made of harmonic copper always deals its average damage on a hit, rather than needing a damage roll.