Your character advances in power by gaining experience.  You need a SET 
amount of EXPERIENCE points for each LEVEL based on your creation points.

You gain EXPERIENCE by:

    being part of a GROUP that kills a monster

You lose EXPERIENCE by:

    fleeing from combat
    recalling out of combat
    being the target of certain spells
    dying

The EXPERIENCE you GET from a kill depends on several things: how many players
are in your group; your LEVEL versus the LEVEL of the monster; your alignment
versus the monster's alignment; how many of this monster have been killed
lately; and some random variation.