Almost any profession can be build to be tanky. Usually tank builds are used either in WvW or in PvP. Most of the time PvE uses "glass" builds (aka zerker), but it is up to you what you use when you are playing alone or with random people. If dungeon group ask people to be zerker, do not join them with your tankier build (their tactics solely rely on killing enemies fast). Find normal people (those who do not want you to play certain build).
First remember/see this:
- Toughness = armor = safe from direct damage
- Vitality = HP pool = safe from conditions
Engineer:
This is a back-line build that abuses might stacking from your skills, sigils, traits, and your party to rain hybrid death upon your foes at up to 1500 range. It's also survivable and has fantastic repositioning ability.
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http://metabattle.com/wiki/Build:Eng...Zerg_Grenadier Warrior:
The Shout Frontline Warrior provides excellent group support and self-sustain while providing excellent control and cleansing. If many warriors run this build in a zerg each will cleanse conditions and heal each other with shouts. Additionally, the warhorn converts conditions into helpful boons and the hammer will control enemy players lacking stability.
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http://metabattle.com/wiki/Build:War...uts_Frontliner Guardian:
Necromancer
Excellent AoE coverage via Wells and Marks, this high-damage necromancer build was designed for large scale WvW encounters. As the walking artillery of your group, whose main contribution will be in the form of damage, you should build as offensively as possible to output the maximum amount of damage.
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http://metabattle.com/wiki/Build:Nec...Wells_Backline
And so on... more builds can be seen here: http://metabattle.com/wiki/MetaBattle_Wiki