Empowered Ward (sorc) not applying full magicka regen
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The tiiltip indicates that it grants Minor Intellect for a 10% magicka regen for all affected. Upon doing the math the benefit is only applying 6.5% bonus regeneration.
That's because it works additively with your base Magicka regen, not what you actually see before using it, which is already buffed by rest of Magicka regen passives like Light Armor passives, CP etc.