Regarding the "Victory" ship battle in Moraby Docks in La Noscea for the Marauder:
As a tank you need to draw the ennemy attention by generating more enmity then you'r allies, you generate enmity. by doing dommage, but also by having specific skill ( usually with 'Increased enmity" in it's description ). I don't know marauder well but if
http://www.ffxivinfo.com/class/marauder.php is up to date with the ARR skills then you will want to use Skull Sunder ( in combo with Heavy Swing ) and also Overpower.
You can probably also take skills from other classes you level, which could help you generating that enmity, like Flash from gladiator. ( don't know if that skill is a good advise since you need mp, again I don't know marauder very well )
I must beg for assistance as this battle is simply unwinnable. I went and leveled myself to the maximum that this battle will allow (17). I acquired another enmity-increasing skill that I hadn't had before (Tomahawk). And I used
exclusively enmity-increasing attacks (Skull Sunder, Tomahawk, and Overpower) until my TP ran out, and
still the enemy went after C'Nangho, and while she laster longer than she did before I knew about enmity, she still fell, and it was DUTY FAILED. And the boss still had about 40% of his HP left.
I didn't attack the Mamool'ja recruits that were behind the boss; my allies advised me to leave them alone. I then had another go at it and went in after them, using Overpower's area of effect to hit more than one at a time, but that only hastened C'Nangho's fall.
Is it possible to recruit other people to join you in this quest?
This kind of bottleneck really is ridiculous. The real version will have a manual that will explain things like enmity and tanking, and the fact that you can't give healing items to allies, but as it is a newcomer to the game has no shot at winning.
So I'm tossing away my pride here: someone just tell me how to win it. I can't make any further progress in the game until I do; this is the only active story mission.