Steelstone
From Will of the Seven Campaign
Steelstone is the strange material used to build the Extraplanar Portal Hub and Lord Aiden's Study. Its appearance seems both metal and bluish marble stone at the same time.
It is an extremely durable, and flexible material that shares the best qualities of both steel and stone. It bends, but does not stay bent. It does not scratch, crumble, rust.
It is unknown how it is made, and who created it.
