The warforged are a race of living constructs created by House Cannith to serve as soldiers in the Last War.
With the signing of the Treaty of Thronehold they have been recognized as sentient beings and given freedom. Ever since then they try to fit in into a world that apparently has no further use for them.
They do not need to eat, sleep or breath. Though they can benefit from the effects of magic food and potions. All Creation Forges have been destroyed since the treaty.