It seems like the barrier mechanic are in an uncertain state right now, so I have a suggestion:
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Rework the “Gain Health equal to X% of Focus Spent” enchantment so that it grants barrier instead of health.
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Rework the “Shield Emblem” gem so that it grants this enchantment when placed on any piece of armor.
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Tune other barrier-related enchantments. For exmpale, it could be “Gain barrier equal to X% of Max Focus on Kill” for weapons.
Thanks for your time…