Aion 5.3 will be released very soon and it comes packed, literally in this sense, with a nearly 400-player PvE battleground. Archdaevas are charged with defeating Ereshkigal's army. In addition, the single-elimination tournament arena, Arena of Tenacity, will make its debut with new Guardian and Prime Archon gear and Estima enchantments to help customize gear.
You can read more on the Aion site.