Beryllium is referred to as “Beryllide”, and is one of the most in-demand metals in the realms. The biggest mines and refining is done by Beryl (the “Soul of the South”). Several groups have figured out the metallurgy to add it to steel and other metals to craft exceptional items, many of which are considered priceless. Little armor is made from it due to its expense, it is mostly weapons. Generally, the items are lighter and easier to use for those who are skilled in handling them, they do not rust or corrode.
Beryllide is extremely toxic to work with, resulting in short term and long term health concerns. Ducateon seem resistant to its worst effects, though avoid making armor from it as well.
The Bronzemen of the Fahyl Forest were known for their bronze-beryllium weapons that were prized as much as Ducateon made weapons. The coloration of bronze was especially prized due to its luster and color compared to plain steel. The elite units of the Duchy of Fahyl got the majority of these weapons – and used them against the encroaching Sea-King empire making its way up the rivers of the south from the sea. Umbak long wanted the beryllium mines in the heart of Fahyl, but every attempt to scout or divine its source failed – like it did for every ally and foe of the Bronzemen at the time. This was a major motivation for Umbak’s [failed] attempt to seize the lands they left behind when the Bronzemen marched north.