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Any ideas on how to unlock the end cutscene? I have completed all Orthen mysteries and special research and spoken to Mr. Mordaut about them.

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about 4 years ago - /u/JagexRowley - Direct link

Ensure you have fully completed the Mysterious City mystery, then talk to Mordaut and choose the Orthen dialogue (or right-click and pick Cutscenes). That should do it, iirc, though it might be talking specifically about Mysteries > Mysterious City.