What are the experience penalties/bonuses?
By Race:
Troll -20%
Iksar -20%
Ogre -15%
Barbarian -5%
Halfling +5%
By Class:
Paladin / Shadowknight / Ranger / Bard -40%
Monk -20%
Wizard / Magician / Enchanter / Necromancer -10%
Rogue +9%
Warrior +10%
Exp penalties are multiplied not added, so a troll sk would be (1.4 x 1.2 = 1.68 or 68% penalty).
http://www.project1999.org/forums/showthread.php?t=1002