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Additionally, Auli’s craftsmanship laid down the very essence of the material world, working alongside Manwë to shape the land. He thrived in his skills and sought to pass them down, particularly to the elves, who in turn imparted this knowledge to the Men of Numenor, creating enduring fortresses vital for survival in later ages, such as Minas Tirith and Helm's Deep.

Auli’s Errors: A Lesson in Humility

Auli's most prominent errors stem from his selection of Sauron and Saruman. Despite being a skilled craftsman, Auli failed to foresee the potential corruption of Sauron, who, fueled by the teachings of his master, became a cornerstone of evil in Middle-earth. Auli sent Saruman to contain this menace, who ultimately succumbed to the same darkness he was aimed to combat.