Mariner class series

The Mariner class series is the default class series available to the Mercury Adept Piers. Piers becomes this class series when he either has only Mercury Djinn set or no Djinn at all. This class series is unique to Piers; Mia, the other Mercury Adept, is a healer rather than a warrior and has her own default class series, the Water Seer class series.

The class series, when at its highest stage of Admiral and compared to the other series at their highest respective stages, has high HP and average Attack, but lower Defense and low PP and Agility. This series' luck rating is high. Noteworthy Psynergy from an endgame perspective includes Diamond Berg, Pure Ply, Cure Poison, Break, and Avoid, and the heaviest area-of-effect Psynergy it has is Megacool. Average stats from an endgame perspective are 140% (144% if you don't factor in Luck).

Analysis
On the outside, the Mariner is a fair class: the Cool series is powerful, and Diamond Dust/Berg are quite powerful (and visually nifty), but they lose their shine when faced against monsters that aren't weak against Mercury based attacks. However, statistically, the class is somewhat lacking. The average attack is augmented by Piers' ability to wield long swords, and the agility is nothing to brag about. Piers' ability to wear armour can also mitigate the average defence stat to make the most of his excellent HP. Furthermore, while is PP stat is lacking compared to Piers' other classes, it is the highest among the other warrior classes, which allows him to get more mileage out of moves like Megacool and Diamond Berg. Finally, the class' access to the Break Psynergy is a boon.