Dark Reign - Muddy the Waters

For this task you need to kill a Stillmoon Water Servants in Stillmoon Temple. You'll need to sit through three spawns of these mobs most likely so bring some entertainment while you wait. They only spawn in one part of the zone and are on a 15 minute or so respawn timer. Below is the only location I've ever found them on my map (it's in the western part of the zone).