"Know, pitiable children of today, that there was a time before Metal, when Man worked and fought and died and even made music with wood and bone, shell and stone." This is how the first chapter, Metal Gods, start. It speaks of history of Man, his captors, other beings, who used Metal, when Man knew Ore. In epic struggle, Man, with the help of Dwarves and knowing how to use Metal, defeated Elder captors and settled in The First City ...
As I see it, Metal Gods of Ur-Hadad is a mini campaign setting, sandbox style, for Dungeon Crawl Classics RPG. It is a great supplement for a great game. It includes Assassin generator, d11 (yes, you roll d11), some Mercenary guilds, a funnel adventure with kid gangs of Ur-Hadad, PLUS a robust city district/gang generator, which is my favourite and one of the best generators out there.
At the end, I must mention one more thing: The majority of money from the sale of Metal Gods PDFs goes to StandUp For Kids effort, which fights teenage homelessness. Be Metal and save some kids with your support for this great supplement of one of the best games ever written.
All written above is my opinion. English is not my native language, so sorry for/if any grammatical errors.