During Tale of the Righteous, he accompanies Gnosi and the Natural Historian into the cave west of the Mountain. He will come to the conclusion that the cave predates Xeric himself, and wonders if it was King Shayzien VII who created the lizardmen. He will add that some believe the two are one and the same.
After the quest, he remains in the cave to further study the temple.
Dialogue
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Trivia
Historian Duffy is named after Eamon Duffy, a professor emeritus at the University of Cambridge.[1]
References
^Jagex. Mod Ash's Twitter account. 30 August 2020. Archived from the original on 30 August 2020. Mod Ash: "He's not a place, but Historian Duffy is named after the Cambridge professor emiritus Eamon Duffy ([1]). Mod John C asked me who my favourite historian was, and I named the one who most often bought me drinks."