Guilds of Copper Arsenic

The Guilds of Copper are a subset of the Guilds of Arsenic who work with copper arsenite as well as arsenical copper.
  The artisans are often blacksmiths involved in arsenical bronze weaponry, or involved in the manufacture of trains. They out of the three subsets of Arsenic make the best merchants and are probably the most well-rounded. Many warriors study arsenic in order to repair and bless their own weapons. They can also produce a unique green dye.
  They are also involved in coper arsenic lighting, in which the electric conductivity of arsenic and copper is exploited. It is the cheapest and most dangerous source of artificial lighting.
  They worship a facet of Khelekeras called Khelekera Xhudn (Khelekeras the Hunter). Their armor is often made of electroplated bones which with arsenic they can strengthen upon impact. They are often involved in bio-warfare, wiping out forested areas of double walkers and such.