Zerritanium

Zerritanium is a pale white metal only found naturally in the Burham Mine. It's properties make it an excellent spellcasting focus, though it is not in itself magical. Zerritanium is also an extremely strong metal, and makes an excellent core for swords. Unfortunately, since the year 304, nobody has been able to gain access to the Burham Mine, since a red dragon made roost there. Roland's Soul Gem was made of Zerritanium.