Shovion ( ago)ID: #1411
These appear inside of the little waterfall cave, south of the binding point on lower bridge. There is an invisible wall preventing you from entering the cave. I assume this is a part of the quest "On A Hunch, Pt. 2" but I could be mistaken. Either way, you cannot get in this place without abusing DL's teleport.
stonephone ( ago)ID: #3831
I was able to pass with my myr monk. Though I am a bit underleveled on this character. There was a barrier but it seemed to disappear as soon as they aggroed me. I had to swim away out of their range.