Walter:
Ah, it's not so difficult. Old pieces of paper have been appearing around here. I'm not sure what they're regarding, but Dep likes this kind of stuff. I want you to gather 5 or so, then hand them to Dep in Exploration Area 4.
You'll find the pieces of paper by defeating the Husk Kraphers and Husk Avians.
And... say hi to him for me, okay?