Sazed is a scholar, and studies religion and other ideals to teach when the Lord Ruler falls and the people are free. During the second book he falls in love with fellow Keeper Tindwyl. After her death during the Siege of Luthadel, Sazed begins to doubt his religions and usefulness in life. All throughout the third book Sazed tries to rediscover his religion, eventually discovering right before Ruin attacks the Kandra Homeland.
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At the end of this battle, Sazed absorbs the power of Preservation and Ruin, becoming Harmony and restoring the world to the way it was before the ascension, through use of knowledge recorded in his copperminds. He makes Spook a Mistborn and heals the damage he did to his body by flaring tin so much. This is revealed to be a request from Kelsier.