If such abilities existed in Othard, they likely wouldn't be referred to as White Magic/Succor as that specifically refers to the magic style that flourished in Amdapor before the War of Magi, later to be practiced only by Padjal and then the Warrior of Light.
But if we take the stories 2.0 and 3.0 have presented us, it does certainly look like White Magic could become more accessible later in the future. 2.0 taught us that the Padjals could teach an outsider. 3.0 taught us that they were willing to leave the Black Shroud. Perhaps 4.0 will further expand this?
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I also find it important to note that many of the iconic Final Fantasy jobs have their own restrictions, even if some are much easier to get past than others. Is it simply the title of "White Mage" that you're looking for or their actual role in a story? The latter is quite accessible without the label.
But if we take the stories 2.0 and 3.0 have presented us, it does certainly look like White Magic could become more accessible later in the future. 2.0 taught us that the Padjals could teach an outsider. 3.0 taught us that they were willing to leave the Black Shroud. Perhaps 4.0 will further expand this?
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I also find it important to note that many of the iconic Final Fantasy jobs have their own restrictions, even if some are much easier to get past than others. Is it simply the title of "White Mage" that you're looking for or their actual role in a story? The latter is quite accessible without the label.