 According to a "docent" (ancient and sentient memory-containing magic item) found in "Secrets of Xen'drik", the very first warforged were created as "host bodies" for a group of Quori (which were very different from Quori of 998 YK).The giants of Xen'drik created their own versions for their wars against the Quori, because the warforged are immune to many Quori tactics.However, according to "Tales of the Last War", the giants invented the warforged, after which the Quori stole the secrets of their creation from the dreams of giants and created their own.