Dancer Tank!!!

[fm_fenrir]

you need to mitigate specific attacks, there is no room for RNG parry / evasion.

The bigger issue is that you can't dodge or parry magic. There would be no issue with a tank that used a bunch of evasion cooldowns to simply avoid incoming damage entirely, except that they'd instagib like a DRG in any fight with magic damage.

Also, to OP, the art team would have to build a completely separate set of "tank" gear for an evasion tank, since the "fending" line is 100% heavy plate and would be completely out of tune with the image of an evasion tank.