you have to unlock them first.
at the start, you have access to feeder class only. ( meaning Fighter, Barbarian, Rogue, Magician, or Guardian. )
to unlock the next class called Samurai, you must successfully complete the Master Quest with one of them.
additionally, you get 2 guild points for a pass.
to unlock the following class called Paladin, you must successfully complete the Master Quest as a Samurai.
if you pass, you receive 5 guild points.
see here for the other classes you can unlock:
http://ladderslasher.d2jsp.org/index.php?g=2the higher you go, the more difficult it gets. but therefore the reward is bigger.
each class have different basic stat points and items they can use.
so each time you pass or change the character class you have to adapt your gear and way of playing to it.
This post was edited by NaRa on Jun 16 2009 04:03am