Every player has four defined statistics:Str - Strength - your carrying capacity. Dex - Dexterity - your fighting ability. Int - Intelligence - your spellcasting ability. Con - Constitution - your health.
These values can be raised in the Adventurer's Guild by paying out extra experience points above your current level. The command 'score stats' will give you a brief look at your current stats.
You raise these stats independently of your level in the Adventurer's Guild. It is important to remember that your spell point and hit point maximums will NOT go up when you raise a level. You must raise the corresponding stats seperately in order to accomplish that.