Originally posted by TangoBlue:

It's the wraith that nearly gives me a heart attack every time. They're very quiet and in my face when I turn around.

Being in the swamp it is only natural to focus on the ground and water for mobs. But if you would only look to the treetops in a full circular sweep on a regular basis before moving from place to place you can clearly see the wraiths and their blue glow before they descend to the ground and then over to you.

You really do have lots of time to see them before they are about to attack.