“<Seshuli puts down the journal and looks back up at you.>
While trying to figure out where de shrines reside, I came across an entry dat mentioned him exploring an area dat sounds very similar to Dustwallow Marsh.
It could be a long shot, given when dis earthen roamed Azeroth, but maybe if you retrace his final steps, you may find something.
I'll mark his last location for you on your map.”