Two questions on Aion

What PvPvE system?
PvPvE is an abbreviation that can be deciphered as "Player versus Player vs. Wild. PvPvE symbolizes the constant and dynamic struggle that unfolded in the abyss between the two races of players and Balaur, race cruel creatures.
What classes exist in Aion?
Initially, you can choose one of four classes: Warrior, Pathfinder, Mage or Priest. After arriving at level 10, each player must choose one of two specializations for its class. The structure of classes and specializations available in Aion is created in such a way that the player can "feel" the game and the main characteristics of his hero, before making a decision on further development of the character.