I know others may question my judgement for saying this, but I believe that "levels" are still a thing that every person, and perhaps even monsters and demons have! Pre-Fall documents refer to "Levels" as a hidden blessing that was granted to all peoples. Through fighting and thinking and putting oneself into dangerous situations, you would acquire increases to your strength, speed, and abilities! Perhaps we no longer have the ability to see these "stats" but I still believe that they are there! Our god still strengthens us! Believe in her!!
-Speech by a High Priest to new wizard Priests