Prior to the Last War, the last king of Galifar commissioned the Dragonmarked House Cannith to construct human-sized "mechanical soldiers" similar in appearance to modern warforged.
While these soldiers would prove largely ineffective due to their lack of intelligence and high cost, House Cannith continued researching the concept hoping for a more viable product.
In 994 YK (four years before the present day), an unexplained disaster destroyed the entire nation of Cyre, leaving behind the nightmarish mist-shrouded realm of the Mournland.
Among the many impacts of this event (including the declaration of a global ceasefire), this resulted in House Cannith losing contact with multiple creation forges and their organisation's at-the-time main headquarters.
Operating from a philosophy that the existence of organic life will always pose a threat that his people will be returned to servitude, he wages a guerrilla war with the eventual goal the elimination of human dominance in Khorvaire; his agents thus serve as reliable antagonists for many Eberron campaigns.
Once a favored servant of King Boranel of Breland, Bulwark is widely held as the driving force behind the inclusion of warforged personhood in the Treaty of Thronehold.
Bulwark disappeared into the east after achieving his freedom; some warforged believe that he will return to unite their race, others have set out on their own journeys to find him, and a small group even claim that he and the Lord of Blades are the same person.
The Godforged have also attracted a small number of non-warforged cultists, who follow the religion's philosophy of "making the body into a shrine" by replacing parts of their flesh with golem or warforged components.
Mark Silcox and Jonathan Cox highlighted the roleplaying potential of warforged player characters in the book Dungeons and Dragons and Philosophy: Raiding the Temple of Wisdom.
They wrote, "this new playable race turns many of the accepted tropes of traditional high fantasy storytelling on their heads, and presents the player with several possibilities for investigating interesting philosophical experiments.
[...] Now these large bipedal meta-humans made of metal, leather, and fibrous joints have their own thoughts and (somewhat naive) emotions, but have no defined purpose within a world without an obvious war to fight".
[12] Geek & Sundry wrote "Winner of Wizards of the Coast’s Fantasy Setting Search contest in 2002, Eberron marries magic with steampunk’s technology, offering a world of elemental-powered airships, industrial nobility, and arcane tinkerers.
[...] I dig the playable Warforged race, which puts you in the mind of a soldier drone seeking purpose (although their explicit maleness serves a pedantic point).