Is There A Final Level Of Cubefield In Final Fantasy 11 What Level Do I Have To Be (if There Is One) To Become A Dark Knight Or Paladin?

In Final Fantasy 11 what level do i have to be (if there is one) to become a dark knight or paladin? - is there a final level of cubefield

Final Fantasy 11 At what level should I (if present) to a black knight or paladin, or another type