Echo of Soul is a Massively Multiplayer Online Role-Playing Game (MMORPG) developed by Korean game developer Nvius and published in North America and Europe by Aeria Games. Open Beta began in South Korea on September 11, 2013, in China on October 31, 2014, and in Western territories on May 28, 2015. Players take control of adventurers, called Soulkeepers, who are tasked by the gods of the world to combat evil. Players have the unique ability to collect souls from the monsters they kill, which they can then use to customize their character. The game has a wide array of both PvE and PvP modes. PvP is available at level 10, so players are able to reap the benefits of this feature early on in the game. For example, PvE includes solo dungeons, party dungeons, and raids. PvP content includes 5 vs. 5 and 15 vs. 15 battles, as well as guild vs. guild combat in both the open world and a separate instanced battlefield. The story begins with a war between the two creators: The Gods and Giants. The Gods win the war, but the corrupted blood of Ymir the Giant King spread and threatened to contaminate the World Tree, the source of all creation. The Gods attempted to purify the world from the malicious sprit, but were unable to. The player must become the 'Soulkeeper' of the Gods and protect the world from harm. Four Soul skills are available: Hope, Innocence, Courage and Peace. Each of them gives the player the ability to trigger a powerful buff during battle.