Battle of the Immortals is a free-to-play fantasy MMORPG developed by Perfect World Entertainment's Shanghai studio and published by Perfect World Entertainment in North America. The game is 2.5D and incorporates story elements from both Eastern and Western culture, ranging anywhere from Norse mythology to the Qin dynasty. The game features a number of classes, and allows for players to enhance their characters based on their birthdate using the Zodiac System. The unique Soul Gear system allows players to grow their weapons and armor along with them as they progress through the game. Battle of the Immortals also features ranked PvP and a territory war system, and hardcore PvE through epic open dungeons and PvE time trials.