Any mobs that require a buff to see them....examples being:
-Any mob that is only visible when wearing Goggles in SMV (Teron Gorefiend series)
-Time Lost Skettis Mobs, only visible when drinking an Elixir of Shadows
Anyways, you get the idea. These mobs can attack you ONLY if you have the buff required to see them...so if you don't have that buff, you're unable to gain agro. It's very nice if you're double boxing a healer and don't want to get agro, or you're in a group situation and want to spam heals![]()