Experience point

Gaining/Earning Experience Points(XP)
There are three methods to earn experience points:
 * Defeat all creatures in a single encounter in encounter areas such as Waterworks, Tangleroot Gorge, or certain special missions like Redwillow's Ruins.
 * Complete optional objectives inside of a mission. Common optional objectives include slaying a boss or named creature within a mission, exploring certain areas of a map, or clearing side areas of threats.  Some optional objectives are shown from the start of a mission, while others remain hidden until triggered.
 * Completion of all main mission objectives. Some main objectives remain hidden until triggered.  This method usually confers much more experience points than the first two methods.  Optional Objective XP is granted instantly and not able to be boosted.  The main XP is bestowed upon completion of the quest and can be changed by any of the following conditions:
 * Times completed: Completing a mission for the third and subsequent times carries a -10% penalty, and an additional -10% penalty for each completion past the third for maximum "extreme repetition" penalty of -90% after 11 completions.
 * Level of mission vs level of highest character in mission: Subtract the level of the highest level character to have entered the mission (even if they later left) from the mission's level and multiply by 10%. This is the bonus for under level difference (max bonus is 50%).  For characters over the level of the quest, the penalty scales with levels over.  +1 over = -10%, +2 = -20%, +3 = -35%, +4 = -50%, +5 = -75%, +6 = NO XP.
 * Difficulty setting: Completing a mission for the first time on Normal difficulty grants a +25% bonus. Completing a mission for the first time on Hard difficulty grants a +25% bonus. Completing a mission for the first time on Elite difficulty grants a +50% bonus.
 * Re-entry: Leaving and re-entering a mission before completion (whether through death, recall, or exit) confers a -20% penalty and another -20% penalty for each additional re-entry.
 * Killing monsters: Killing a large portion of the monsters present can confer
 * +10% Aggresion bonus
 * +15% Onslaught bonus
 * +25% **Conquest** bonus
 * Not killing monsters: On the flip side, completing a mission without slaying anything can grant
 * +5% Discreet bonus
 * +7% Devious bonus
 * +10% **Insidious Cunning** bonus
 * Disarming traps: Disarming a large portion of the traps present can confer
 * +5% Tamper bonus
 * +7% Neutralization bonus
 * +10% **Ingenious Debilitation** bonus
 * Finding secret doors: Finding a large portion of the secret doors present can confer
 * +5% Observance bonus
 * +7% Perception bonus
 * +10% **Vigilant Sight** bonus
 * Destroying breakable objects: Destroying a large portion of the breakable objects (barrels, vases, caskets, etc.) present can confer
 * +5% Mischief bonus
 * +7% Vandal bonus
 * +10% **Ransack** bonus

All of the bonuses are added together and can offset the penalty for having high level characters in the party. The exception is NO XP if you have a player that is 6 or more levels over the quest level. NO XP cannot be offset, no matter how many bonuses you earn.

Experience Points to Level
 