An Empty Vessel........

[Irenia]

Their damage calcs should be normal, they just have an increased base action damage and HP restoration. Most casters have a 10% and 30% increase in damage and healing, but blue mage has a 10%, 20%, 30%, 40% and 50% increase to make up for the weapon.

When BLU was revealed, they specifically said that their damage calculations do not take weapon damage into account at all, and that there is a higher weight on intelligence than other caster's to compensate.

Unless there is testing that was done that I missed, I see no reason to believe that there was deception in that statement.

EDIT: and the weapon damage variance at 70 is so large that a 15% increase doesn't feel like it can cover the difference.