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Even these grandmasters of all magic are spent after casting their beloved Meteor spell.
Sprite
Minimum Level
40
Earned
Eureka B7
Strength Grade
C+
Agility Grade
B+
Vitality Grade
B+
Intelligence Grade
A
Mind Grade
A
Battle Command 1
Fight (4 skill points per use)
Battle Command 2
Magic (12 skill points per use)
Battle Command 3
Run (no skill points)
Battle Command 4
Item (4 skill points per use)
Available Magic
Black Magic LV. 1–8, White Magic LV. 1–8, Summon Magic LV. 1–8
So, let's get this straight: the Sage has access to every Spell (though they can't use the Evoker version of Summon Spells), has the highest stats aside from a slight disadvantage in Intelligence compared to the Magus, and has way more MP than any other mage Job... yeah, it's safe to say the Sage is the best magic using Job in the game. There's no reason to use any other spellcaster once they're available. (Even the Magus's Intelligence isn't really relevant since the Sage has access to excessively powerful Summon Spells.)