Since this quest pretty much covers all jobs, I thought I'd post this here. (Spoiler Below)
During last beta phase, I got my Conjurer to level 22, and had a heck of a time with this main quest. I tried four times before finally giving up and deciding to wait until the real thing. After a lot of searching, I stumbled upon this article, ( http://eorzeareborn.com/ifrit-story-primal/ ) which gives a pretty good explanation on how the fight goes. Hope this gives insight to anyone else who might be stuck on this fight. Also, if anyone else ( who has completed it on Conjurer) can give any extra tips, they will be greatly appreciated.
Edited, Jul 7th 2013 10:49am by Lorielll