[Momo's not going to argue something when he knows almost nothing about Fae considering the dearth of information on them (or at least, his bad luck in finding information about them besides what he's been told), so he just listens for the moment. It does sound like the magic thing might be on the right track, though, considering what she says next.]

If you can sense magic, then it could've been the leyline itself you were picking up on. What was that other place you were talking about - the roots of the tree thing?

[Momo goes to the Northern Outpost fairly often, but the main cave he can think of is that one with the stolen books near the town, and off the top of his head he couldn't tell which tree she'd be talking about.]