Magic/Mystic items are typically Singularly Bound. Mundane weapons conform to normal Incarna weapons and Incarna item properties.
The Steel Realms is an ancient place. Going back, even before the arrival of the Blood of Saemon, there have been weapons of magical and fantastic nature in the Celestine Time. Before that, when the creatures lost to memory fought, they too wielded exceptional weapons, though few in number are known or survive from these early times. These fall under the standard Notable Items/Goods auspices.