Not exactly pathing, but I just noticed that coming into Kael from WL there are a series of white boulders along the path. Standing on these rocks blocks you from Line of Sight casting, as do a lot of the little ridges on the floor, and they also block mobs from Line of Sight agro-ing, so a see invis KoS mob can walk right by you if you are on one of the big rocks.
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