He got his shaed cloak from her, which may be important later. He learned a lot of new things about the creation of Fae and the long-ago war between shapers and namers, and some more about how the moon works, going between the two worlds, all of which I believe will play a central role in what goes wrong for the world. He got to meet the evil prophecy creature in the tree, which may play an important role in the future. So not entirely irrelevant, and that's just off the top of my head from memory.