The job system in Final Fantasy XI is introduced from the original Final Fantasy III, in which each of these jobs has unique abilities. Players should first activate certain ability if they want to use it. Each ability is available in a certain period of time and will be cool down after a period time of usage and player should have to wait if they want to reuse it. l traits, which are passive abilities that are always in effect; and a special "2-hour" ability that performs some extraordinary function and has an extraordinary 2-hour-long cooldown period to go with it. Players are able to change their jobs any time they wish inside their 'Mog House' or 'Rent-a-Room', and are also able to get a “support job” once they reach level 18 in order to learn additional skills and try different combinations, though the job will be half the level of the player's main job. Players are able to improve their job abilities through defeating monsters or completing quests. As of November 2007, a player may choose from 20 different jobs. Final Fantasy XI has six job classes available including Warrior, Monk, White Mage, Black Mage, Red Mage, and Thief. Players can unlock the other jobs by completing quests once they are upon level 30. These jobs include Paladin, Dark Knight, Beastmaster, Ranger, Bard, Summoner, Samurai, Ninja, Dragoon, Blue Mage, Corsair, Puppetmaster, Dancer, and Scholar.