Dark Knight can not come off of Gladiator... Gladiator is a tank.. I know that Paladin came from Dark Knight but with how they have the armoury system it just does not make any sence ( at least to me )... you play Gladiator ( tank ) to get Paladin ( tank ) you play lancer ( dd ) to get dragoon ( dd ) conjurer ( healer ) to get white mage ( healer ) well you get the point... playing Gladiator ( tank ) to get Dark Knight ( dd ) does not make much sence with how they have the armoury system.. Know if when you got the Job they made it more like FF 11 and you had to start from lvl 1 and you learn all new skills and spell ( some that others have or are similar to ones others have ) that complement the job instead of having access to skills that don't match the job much.