Blue mage at patch 4.5

[Powercow]

Could also make it like Infuriate, have to be in combat first, just so there's not even the chance of a boss dying before people can actually try to attack it.

Have a friend tag it, or send in a chocobo first, BAM! Easy peasy.

Death actualy exist in Pyros/logos, its succes rate change depending of the target life. Spamming death on a full life target will just consume all your MP for no result.

Ah but they said in the LL that they're worried you'd go into Omega and 1shot it, thereby nullifying the fight. If that's a valid reason to keep BLU out of endgame content, then they'd have to be awfully inconsistent to not have it function like that in the open world. Clearly the BLU class identity is all about being the most OP thing in the universe and there's no way at all they could go about not letting BLU break the game. Not. A. One.