There is a Servant in front of the tavern in Riverford, who talks about her lord, Sir Cervantes, going out on an adventure. She is worried about her master and wishes for someone to accompany him. There are two solutions to this Side Story, with both of them involving Cervantes, who happens to be in South Orewell Pass. Before heading there, the first solution requires you to use Guide/Allure on someone in Atlasdam. The Enthusiastic Youth is located in the Palace Gate area, in front of the library.

Once you have him, it’s time to hunt down this mysterious knight in South Orewell Pass, so teleport to Orewell and exit the town. Luckily, the NPC located near the entrance to Dragonsong Fane is Cervantes, so speak with him with the youth in tow to finish. Now that you know where Cervantes is located, the other solution involves using Challenge/Provoke on him. Luckily, for being a chosen one, the Mysterious Knight is a real pushover, with only a strength of three. Finish him off to finish the quest.