Does it reduce the number of 1d4 dice rolled (essentially reducing the disapproval range) or does it just reduce the total result of the number of 1d4 dice rolled?
Quoted from the book pg. 122
Each and every time a cleric rolls a natural 1 on a spell check, he must roll on table 5-7: Disapproval. In addition, any time a cleric rolls within his disapproval range (based on number of failed spell checks on this day), disapproval also occurs.
The roll is 1d4 for every point on the spell check. For example, if the cleric rolled a natural 1, he would roll 1d4. If he rolled a natural 4 and that counted as disapproval, he would roll 4d4. And so on. This roll is reduced by the cleric’s Luck modifier.