I'll have to disagree here. Black Mage has traditionally had these spells as well.
That said, Dark Knight should by all means get more usage out of the spells by far, and I don't think this would be very hard to ensure, given that Dark Knight has better access to Haste gear to reduce recast times, and better tiers of OA which would actually make them better to cast. If that wasn't enough, I'm sure you could add something like a job trait that makes the additional effect chance higher.
I think a good analogy here would be Dual Wield. Sure, jobs other then Ninja get the ability, but nobody will argue that they are the master of it. I think that unlike certain spells or abilities, these two spells should/would be a large enough amount more useful to Dark Knight then Black Mage to the point where asking for exclusivity is an unreasonable attack on another job's traditional territory without defending that of Dark Knight's.
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Back when SE was finally doing the White Mage Q&A replies (where they totally ignored the request to make bareffect spells useful and played off their reply to it like we were asking them to fix our barelement spells which we never did... grrr) they did mention them, but they haven't said anything since. Here is the relevant quote for those who are interested:
As for Bardeath specifically, given the way the barspells work currently and SE's total shrug off of requests to fix them, I don't think we'll see it. Slight pity, because despite how useless the spell would probably be, I'd use the autotranslate phrase of it for a great many jokes.
I don't think that Black Mage or Dark Knight getting either Doom nor Death would increase the number of monsters that get either of these spells though, so it isn't that big a worry for Barstatus on these effects. Still, I'm sure I speak for most players when I say that White Mage and Red Mage have been hosed out of having Bardark/ra and Barlight/ra for far too long.![]()