The participation in PvP is rewarded with Abyss Points in the game. The game currently does not allow factions to fight against those of their own race, except for casual duels or in the Arena, or Panesterra. Legions in control of a castle are entitled to funding from taxes and players within the faction get specials from NPCs and discounts for travel and vendor items. Battle to control these castles involves combat against players of the opposing faction and computer controlled NPCs at the same time, using siege weapons obtained from PvE raid content. Within these zones are fortresses which can be controlled by individual Legions (the Aion equivalent of Guilds). The PvPvE gameplay of Aion revolves around battles within the Abyss and Balaurea (PvP zones).
Generally the skills located farther along in the chain are more powerful than those at the beginning, or those that have no prerequisite. Many of the skills acquired as characters progress may only be performed in a certain order, or chain.
