Why isn't the "God of the forge" pantheon available?

I'm playing Civilization VI: Rise and Fall now. I just got enough faith to start a pantheon and I can't seem to find "God of the forge".

Is there a requirement for this pantheon, or was it removed?


Pantheon beliefs are first-come, first-serve so it's possible that one of the other civilizations started a pantheon first and picked God of the Forge.