Rappelz is a free to play MMORPG that features a robust pet system and dynamic PvP. It offers three races and 15 distinct classes that support a wide variety of play styles, all of which are effective in both solo and group play. The dungeons in the game are huge shared labyrinths that have challenging bosses, plus they can be captured by guilds and defended in weekly sieges. The setting is a gorgeous 3D world with environments ranging from floating cities to crystalline caverns. The main draw, though, is the pet system, which is outstandingly flexible and customizable.