Whenever you kill a monster, you earn experience points.  When enough 
experience points are earned, you raise a level.

Things you should know about experience points:

  * When damaging a monster at low levels, you get experience points.

  * If you kill a monster of higher level than yourself, you get bonus
    experience points.  If killing a monster of lower level you'll gain
    less experience points

See also: [GROUP](/help/commands/group/), [SCORE](/help/commands/score/)