It's there in the description of the skill: Increases your offensive power when using Trial Cross, Justice Cross and other skills in Sacrifice Line by demonstrating furious power to desecrater.
It only increases the magical attack for Trial/Justice Cross, and Offering/Pure Offering. Doesn't help with how much you heal.
To heal more: Add more INT to your gear, and/or fix the whites to your cleric rod (magical attack, attack rating, and magical reinforce).
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We should stop treating people like objects, or at least treat our objects with more respect.
