DISCLAIMER
I made this build based on personal experience. I'm not a dedicated player, so it probably has some potential of improvement.

DESCRIPTION
A support Tank build suitable for veteran dungeons (not yet thoroughly tested in DLC vet dungeons). The motif of this build is to mitigate as much damage as possible, or to not take damage at all through the use of damage shields.
This tank build relies heavily on the Swarm Mother monster set to group up mobs for easy AOE damage. A tried-and-tested method during boss fights with lots of ranged adds is to activate the Shield Discipline Ultimate while taunting as many adds as you can, since the Ultimate negates the cost of Pierce Armor and it allows the Swarm Mother set to proc while not actively blocking.
Depending on the player experience, the group or the dungeon/boss, Absorb Missile may be replaced with Bone Surge for the support synergy. Mass Hysteria may be replaced with a second damage shield ability and Dark Cloak may be replaced with Resolving Vigor as a stamina heal. Instead of Ambush, I chose Shielded Assault as a gap closer because of the damage shield. The Aggressive Horn Ultimate may be switched with Bolstering Darkness or Reviving Barrier/Replenishing Barrier (whatever floats your boat), depending on the dungeon and the group.

EQUIPMENT
Head: Swarm Mother's Visage (heavy) - Infused, Max. Stamina Enchantment
Shoulders: Swarm Mother's Arm Cops (medium) - Sturdy, Max. Health Enchantment
Chest: Fortified Brass Cuirass (heavy) - Reinforced, Max. Stamina Enchantment
Hands: Fortified Brass Gloves (heavy) - Sturdy, Max. Health Enchantment
Waist: Gloom-Graced Girdle (heavy) - Sturdy, Max. Health Enchantment
Legs: Gloom-Graced Greaves (heavy) - Infused, Max. Stamina Enchantment
Feet: Fortified Brass Sabatons (heavy) - Sturdy, Max. Stamina Enchantment
Neck: Gloom-Graced Necklace - Healthy, Reduce Stamina Cost Enchantment
Ring: Gloom-Graced Ring - Healthy, Shield-Play Enchantment
Ring: Gloom-Graced Ring - Healthy, Shield-Play Enchantment
Front bar weapon: Fortified Brass Sword - Decisive, Weakening Enchantment
Front bar shield: Fortified Brass Shield - Infused, Max. Stamina Enchantment
Back bar weapon: Fortified Brass Sword - Decisive, Crusher Enchantment
Back bar shield: Fortified Brass Shield - Infused, Max. Stamina Enchantment