User blog comment:GamerNerd i/Discussion at Dinner, Talk on the Terrace/@comment-27053902-20171128004510/@comment-26593304-20171128013746

>Implies an understanding of Pix but not Lexa

Lexa is Nadia's mentor in the same way that Pix is Aidan's mentor. She introduced Nadia to the Multiverse and taught her how to use the Tome.