The Blue Mage is perhaps the most unique job in all of Final Fantasy 14. Usually, jobs follow a set path of slowly gaining extra abilities and mechanics as you master them, but the Blue Mage has its own ideas, and it's not keen on following the rules!
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Before we get started on the ins and outs of Blue Mage, there are some important things to understand about this Job. In-game the Blue Mage is considered a "Limited Job". This is not for no reason, as Blue Mages can't queue for content like other jobs can, they can't access competitive PvP modes, they can't go higher than level 70, and they can't progress the Main Story Quest.
The Blue Mage was originally designed to be the first of a few Limited Jobs, but there have been no new additions since its reveal. It's best not to think of the Blue Mage in the same way as the other Jobs.
Now we've got all that out of the way. How does one become a Blue Mage? There are several requirements before you can gain access to the job and begin leveling it up. The first is that you complete the "Ultimate Weapon" step of the Main Story Quest (basically the end of the core story). You need to be level 50 in either a Disciple of War or Magic, and then head to Limsa Lominsa Lower Decks and speak to the Zealous Yellowjacket (located at X:10.0 Y:11.0).
The Zealous Yellowjacket will give you the "Out of the Blue" quest. Completing this will award you with a Soul of the Blue Mage and introduce you to Martyn the Blue Mage. Completion of this quest will also award you with a Rainmaker staff, equipping this and the Blue Mage soul will activate the job at level 1.
It's always worth completing job quests, as you'll unlock a raft
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