The Hero of Ages, Book Three of Mistborn, is the climactic conclusion to the epic fantasy saga written by Brandon Sanderson. To end the Final Empire and restore freedom, Vin killed the Lord Ruler. However, this act has brought back the Deepness—the lethal form of the ubiquitous mists—along with increasingly heavy ashfalls and ever more powerful earthquakes, threatening humanity's very existence.

Having narrowly escaped death by becoming a Mistborn himself, Emperor Elend Venture searches for clues left by the Lord Ruler that may save the world. Meanwhile, Vin is wracked with guilt for unwittingly releasing the mystic force known as Ruin from the Well. Ruin desires nothing less than the end of the world, and with its near omniscience and ability to warp reality, stopping it seems an impossible task. Vin must tread carefully, as even discussing plans with Elend could lead to Ruin learning their strategies.

Bringing together intense action, intricate plotting, and deep character development, The Hero of Ages is a testament to Sanderson's ability to weave together a narrative that both captivates and inspires.