Volume 2: Search for the Blue Adepts
"Now that you've named it, I agree with you, Grimfast," Radagast responds.
"I was sensing it, too, but I was reluctant to put a name to it in case I was wrong."
"Still, it's... different... in some way. Perhaps, while it was attempting to corrupt this land, this land was corrupting it in return. That would be interesting. You would think that would be a good thing, though, right? How could it make Mordor worse?"
As they talk, Radagast follows Lady Isile's lead as she heads off to the east. As long as Anira had the Magnificent Mansion spell, he felt they were safe enough at night when they might choose to rest.