Famished ravener/Power of Water

[Yajirobe Yajipants]

After several searches, reading, and whatnot I felt I should start a thread on this. I'm in Kaesora and after the Power of Water from the famished ravener. There's no loc available on Alla. There is, however, a picture. From the background of the pic, it seems the thing is definitely in one of the tunnels on the spider side.

Looking at a map on mapfiend.net, there are two famished ravener markers on the spider side. I spent a couple of hours killing everything in/around the tunnels and haven't seen anything. There are a couple of tales of raveners, frenzied raveners, and gorged ravener dropping the power of water. I killed some raveners and some frenzied but no drops.

I was curious if anyone had any info on this.