Not much, really. Just that they're nightmare beasts that like to attack people, for the most part. And that they're kind of dangerous? Or can be.

[It's clear that someone hasn't paid them too much mind. A combination of "Out of sight, out of mind", and the fact that Naoya had apparently dealt with one and only got a bit of bruising for his efforts.

He'll flip between a few pages, taking in what they looked like, reading a few descriptions that are there..]