the EXTREME DUNGEON is coming to C9
Webzen has just announced a content update for its free-to-play action MMORPG, C9 - Continent of the Ninth Seal, that is going to add to the game a new dungeon called Extreme Dungeon, which will feature a new raid mode with 3 new raid bosses. This new dungeon will deliver a whole new high difficulty challenge to high-ranking C9 players and will be available starting from April 24, 2013.
Moreover, as a special incentive, returning players who have at least one character with level 50 or higher will be given special rewards for re-visiting the game.
Source of information: Webzen press release