Soulsteel

Soulsteel, the material of hammered souls, can mean many things. Do you mean:

or
 * Soulsteel, used by the Abyssal Exalted and one of the Five Magical Materials?
 * Soulsteel, made from hammered souls by Artificers?
 * Stygian Steel, also called Darksteel and confused with the inferior Soulsteel?