The Metal domain was created by Malbrig, which he subsequently shared with the other gods when he passed from the world (3307). Gods who entered the world since then have not been given access yet, and The Legion even revoked access to this domain from all except himself, Bael and Gadabout (4203).
As the god of metal, one promotes the finding of metal and metalwork. The best smiths in the world are blessed by the gods of metal and their work is peerless.
Miners also send prayers to these gods.