Here is a summary of the class based rules:
Priest
Weapons: no daggers, no axes, no shortswords, no crossbows, no plate
Magic type: Cleric
Mana regen: +200%
Mage
Weapons: no axes, no shortswords, no maces, no crossbows
Armor: no plate, no chain
Magic type: Mage
Mana regen: +200%
Rogue
Weapons: no axes, no longswords
Armor: no plate, no chain
Magic type: Arcane
Thieving abilities (pick locks, steal from creatures)
Jump power: +50%
Speed: +25%
Mercenary
Weapons: no maces
Magic type: Arcane
Thieving abilities (pick locks, steal from creatures)
-50% steal chance (penalty)
Melee damage: +25%
Magician
Weapons: no axes, no longswords, no maces, no crossbows
Armor: no plate, no chain
Magic type: Mage
Thieving abilities (pick locks, steal from creatures)
-50% steal chance (penalty)
Mana regen: +50%
Warlock
Weapons: no crossbows
Armor: no plate
Magic type: Mage
+50% mana regen
Paladin:
Weapons: no crossbows
Magic type: Cleric
Archer:
Armor: no plate
Magic type: Arcane
Sailor:
Armor: no plate
Magic type: Arcane
Melee damage: +25%
Speed: +12.5%
Knight:
Armor: All
Weapon: All
Magic type: Arcane
Melee damage: +50%
Looks like the Archer needs the most love, like a missile weapon bonus.