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Welcome to the forums.
Aside from agro control, there are other very important roles for a group's tank.
As the tank, it is your job to position the mob. That is a very important role that can get overlooked. You want it out of the way of possible adds and you generally want it facing away from the rest of your group (in previous games most defensive abilities don't help if the attacker is behind the target). In Vanguard, position is likely to be even more important because more attacks will be position dependent than in other games based on what we've seen so far.
Deciding which target to kill in multi-mob encounters is the job of the tank. He should call for offtanking or crowd control and direct the party on which mob to focus their fire upon.
You also need to understand when to use your defensive specials (especially if they are on long timers), so being cognizant of your healer's mana/ability is important. Not "getting deaded" is not just the healer's responsibility.
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