As is known for the aion players, there will be the new aion fortress battles for players. Fortress Battles allow players and clans to take on these siege structures at any point, in either PvP or PvE (Player vs. Environment) modes, so they can gain incredible new skills and leveling benefits. What is more, Fortress Battle system can be the link between Aion's political system and others, so that you can choose your battles wisely. Clans can register to siege a fortress (in a process similar to castle sieges), and then must assault and capture several NPC camps, then attack the Command Camp, capturing and replanting Combat Flags.

In other words, Fortresses themselves act as a small residential clan area, which is similar to a clan hall. Clans can acquire fortresses through a siege, which can last up to an hour and can occur as often as every four hours. Fortresses can be both large and small, depending on their location, and they have political ties to the clan that owns the castle in that territory.

Clans that take a fortress can use it to boost their clan's reputation, as well as get access to special items, skills, and other rewards. The level of defense depends on the current owners of the fortress and their localized clan affiliations.