Malleum

The only material that can be mined in the world of The Sundered. Strong enough to build with, yet malleable enough to shape as needed, it is the primary building material in a world robbed of trees and other elements by the Black Water. Dark grey with a slight rainbow sheen, it starts out wax-like, and over time, returns to that texture, needing to be scraped up and reheated in order to be reused.