Soulsteel (WTO)

From the White Wolf Wiki, the most complete White Wolf reference

In Wraith: The Oblivion, Soulsteel is the generic name for the product of soulforging, a lightweight, metallic substance used for everything from bricks to playing cards. Soulsteel objects decay after several centuries of use, and are a light gray in color. Soulsteel is the standard manufactured substance of the Underworld, and will comprise most Hierarchy weaponry. There is a denser, more powerful and expensive alternative, called Stygian Steel or darksteel.