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
It is widely argued that the Mariner class series is better for battle than the Water Seer class series, while the latter is better at healing.