So one of your PCs has become a cult leader dedicated to the divine principle of adventuring into filthy holes in the ground to kill monsters and take their stuff. What personnel benefits accrue?
Step 1: Roll 1d4! This is how many crazed followers show up to assist you with this session’s adventure.
Step 2: The DM rolls one die whose maximum value is equal to or less than your level! (Minimum 1d4, going up to 1d6 at level 6, 1d8 at level 8, etc.) This is the total number of character levels the DM will distribute among the followers. Maybe the levels will be divided up evenly, or maybe they’ll all go to one follower and the rest will be 0-level normal men. Who knows?
Step 3: For each follower, the DM rolls 1d20 twice on the following table! This indicates their key personality traits.
Random Cultist Personality Traits:
Now you’re done. Hurrah! Try not to get minion-shanked.