Quote Originally Posted by Behold the Void
Are you adapting the Challenge Rating from normal D&D where the CR is equivalent to the level of party that should be fighting it? If so, don't forget to increase the power of the monster with each given Challenge Rating because if you are allowing for six party members instead of the standart D&D for for which the monsters are made, the game will be far too easy.
Not quite, it's more of a gross concept of during that part of the game how hard you can expect the enemy to be. For instance when fighting OJ Simpson you're assumed to have no higher then level 5 spells. (Not taking to account you prepared ahead of time for this encounter..) so bassicaly you're fighting gods in the midsts of just progressing normaly..