disciple of magic tank!!

[TheodoreMcIntyre]

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I'm not sure that monsters are weak to any one element more than the other, and I also recall reading about how elemental bonuses aren't really a thing for Player -> Monster damage.
I've always imagined a DoM tank working based on barriers, like a BLM does. Give them low HP but a tank stance that absorbs, say, 50% of damage as damage to your MP. Make it a piety based tank. More MP = more damage mitigation. Uses flashy illusions to keep hate and its AOE attack uses TP to absorb, say, 15% of damage as MP. Cooldowns would include things like an MP version of Bloodbath, something that reduces the amount of damage to your MP per hit, an MP version of invigorate, and its "Oh Shit!" button could be a barrier that absorbs damage equal to twice your max MP.
I dunno, I like to toss around the idea of out-of-the-box classes. I would like to see more unconventional class types in XIV.

[KikoriL]

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We also have nearly no practical research about resistances... except one very nice link here.
https://dl.dropboxusercontent.com/u/...%20summary.TXT
Someone stacked it up and found out just how useful the elemental resistances can be when built up. Magic users strike me as able to do the same thing with a skillset around it, without resorting to overmelding tons of Materia to do so. It stands to reason this system has a similar kind of math to the slash/pierce/blunt styles of damage, and could be turned around to allow offensive aspect damage specialization as well.
Just saying, though, it's not fully explored and seems like it could be a quite practical wildcard of a tank that certainly fits the magic bill in its own right.