Since the Echo allows you to peer into another man's mind how about a class that specializes in mind manipulation and control? Could do things like temporarily turn an enemy into an ally or cause a mob of enemies to attack each other for a few seconds. Specializes in debuffing and stunning enemies, making them easier to kill. Hmm, while we are at it we could put said class in heavy armor, give it a tank and dps stance and call it Herald (short for Herald of Hydaelyn).