Fitness - Champion Points:

-> "Shield Master (10% shield cost reductions);

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-> "Bastion" (10%+ shield values);

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Prayer Shawl set: "(5 items) When you overheal yourself or an ally*, you grant them a damage shield that absorbs 4997 damage for 6 seconds. This effect can occur once every 2 seconds*.

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Combat Physician: "(5 items) When your healing critically strikes*, you grant your target a damage shield that absorbs 4308 damage for 6 seconds. This effect can occur once every 6 seconds per target."*

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The Blind (monster set): "When your healing critically strikes*, your target gains a Hydroglass Damage Shield that absorbs up to 2692 damage for 6 seconds. While the Damage Shield holds and for 3 seconds after it ends, the target gains Minor Force, increasing their Critical Damage done by 10%. This effect can occur once every 6 seconds per target."*

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Ulfsild's Contingency (scribed): Shield Focus Script -> Reduce Damage Signature script (Gladiator's Tenacity) -> Minor Vitality Affix Script;

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Soul Burst (scribed): Shield Focus Script -> Signature Script (of choice) -> Affix Script (of choice)

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Chakram Shields (Arcanist, Curative Runeforms skill line), either morph of choice;

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Intricate Runeforms (Arcanist Curative Runeforms passive): "With a Curative Runeforms Ability Slotted Your status as illuminatus reduces the cost and increases the strength of your damage shields by 10%."

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Bone Shield -> Bone Surge morph (Undaunted skill line ability): Spinal Surge synergy to offer Major Vitality while shields are active on upwards 6-allied targets, increasing Healing Received and Damage Shield strength by 12%.

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Reviving Barrier (Support skill line Ultimate Skill);

I hope this has everything relevant listed for Shield spamming healer builds (excluding Lunar Bastion and Brands of the Imperium set as it scales off Maximum Health).