What should I be for my 2end Job Advancement?

I'm a Magician. I was thinking of going for Ice/Lightning, but I'm not sure if I want to become a Cleric. What are the perks to becoming a Cleric? And is Ice/Lightning the only kind of Mage that can attack multiple targets at once?

I don't think I'm going to become a Fire/Poison, but if theres a good upside to that you can tell me...

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