I would like "Killer" traits return

[Triston]

In defense of black mages, they had access to a multitude of spells of different elements, so there was never an excuse to not take a black mage. If the enemy was resistant to fire, the black mage would use something else.

While technically true, any mobs that resisted Thunder or Ice SEVERELY reduced BLM damage over a fight, because of how every spell in XI had different potency, and Thunder was by a wide margin their highest-damaging spell. Of course, because of how Magic Accuracy and Resistances worked, you could still luck out and get huge burst against even an Earth element mob by just having your Thunder not get resisted, but over multiple fights you lose a ton of damage to resistances and are generally better off using Aero, a significantly weaker spell.