You could choose Occultist for your second class.
BENEFITS OF OCCULTIST FOR SUPPORT BUILDS;
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Blood of Dreeg: Group Heal and king buff. Provides a nice fat burst heal, while boosting HP Regen, adding some retaliation damage, and can provide your entire party with insane Acid/Poison res. Long duration and short cooldown allow this to have 100% uptime as well.
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Curse of Frailty: Slows enemies and reduces their resistances to a wide variety of damage types. Radius of effect is also huge, and cooldown is practically non-existant. Great support for crowd control.
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Bloody Pox: This is one of the best Threat producing skills in the game. Combined with Judgment can also accelerate the spread of the Pox from enemy to enemy. Tack on the Devotion Ability Eldritch Fire and youll soon have a spreading Poxfire thats going to afflict enemies with so many debuffs on top of your Curse of Frailty that your Threat will go flying through the roof. Almost a Warcry of its own in a way.
OTHER AWESOME BONUSES OF OCCULTIST AS TANK
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Possession: 100% skill disruption protection!!! Not to mention everything else! This skill is very very good!
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raven pet: good for heals if you need an extra source of healing. While i wouldnt rely on it as your sole source for healing, its a nice little auto-heal that can help you from time to time.
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the toggled skill that applies vitality damage to your attacks, its 3rd node can provide Vit res which is nice on top of everything else.
OTHER SUPPORT BUILD;
THEEE SUPPORT BUILD OF THE CENTURY! @the8anarchist Support Deceiver. This thing is awesome for healing and support!