Highest possible is 24, but you can 'technically' level up to 99.
That's only feasible (probably) by literally murdering everything and completing every action that gives XP. If you really try to earn the phat XP, you typically reach 21 or so on an average playthrough, but 24 is probably the highest you'll be able to reach.
Maybe I'll complete every quest and murder everything that I can get away with and see if I can get higher. All those paladins in Arx are probably delicious amounts of XP.
Last edited by Alexstrasza; 02/11/17 10:42 AM.
