Tier 1 Classes:
Bard
Berserker
Cleric
Druid
Mage
Thief
Warrior
Tier 2 Classes:
Gladiator
Gypsies
Monks
Priests
Rangers
Witches
Tier 3 Classes:
Assassins
Bishops
Necromancers
Psionists
Samurai
Sorcerer
Templars
Templars
Tier 4 Classes:
Deathknights
Paladins
Ninjas
Telepaths
Wicasas
Wizards
For more class help and info, please check out the mud help files.