That may be, Vanille, but it would be the simplest fix to summoner without altering scholar by adjusting the mana cost of our skills. Unless the piety > mana conversion is done by the same coding across all classes, which would then require adding in new code. But, I would think the amount of time needed to change that coding would be far less than would be needed to balance out changes to the skill costs or creating new gear.

Can't adjust Aetherflow without affecting scholar. Can't adjust energy drain without affecting scholar. Can't add piety to gear without it giving black mage more mana to cast additional spells. Add in costs to balance test, I would go with SE just changing the piety conversion to save money and time.