If you don't mind megarandom, that "exotic individual" that Nianxi is looking for would be Ulrisk, hoping he could translate those books. This could also be a minor intro for the 6 Relic weapons.

And if Susanna returns to the bar in a relatively short amount of time, there could be an interesting interaction between her and Nianxi/Xiandra, as Nianxi's armor starts emitting black smoke when demons are nearby, and she has her newly acquired, though not fully developed, 6th sense. Feel free to make up a dialog for my character in your post if needed, and write me a PM if you have any questions.