The Engineer is a class that can provide sustained damage or can become a beefy tank. They carry a huge gun, wear heavy armor, and use bots to help them in battle.
The Esper’s primary class-based resource is psi-points, which he generates by casting “builder” abilities and that are consumed by “finisher” abilities. These finisher abilities are magnified in power based on the amount of psi-points consumed.
The Medic is a close to mid-range class. In general, Medic abilities are shorter range than the Esper’s or Spellslinger’s.
The Spellslinger is the premier kiting class, able to use his Frost spells to root and snare enemies while dealing heavy damage on the move.
The Stalker is a melee class with high-burst potential when expending skill synergy acquired via stealth or attacking his foe from the rear. By properly using evasiveness, the Stalker also makes a formidable tank.
Depending on how you choose to configure your Action Set, the warrior can be played as a straight-up tank, DPS, or a hybrid fine-tuned to the infinitesimal.