If Blue Magic and its associated quests are tied to learning from the beasts and creatures of the natural world, I'd be surprised if it was based on magitek. I'd expect more of a tie in to the Beast Tribes (or perhaps even Thavnarian alchemy) in place of Garlemald. I also think that heavy armor and bladed weapons are over-represented with tanks at the moment. You need an aesthetic that feels different from the present tanks.

I'm personally hoping that Blue Magic incorporates shape-shifting, perhaps in the same vein as Vincent Valentine's beast forms.

Either way, here's hoping for a tank which doesn't use slashing damage. At the very least, let it be an excuse to put an end to that awful slashing debuff for good.