Editing Familiarity Question (section)

===No shapeshifters===
The simplest yet most rigorous solution: ban shapeshifters altogether. If you want to do something like this make sure to tell the players in advance, right at the first steps of the campaign. If you do this while setting the tone for the campaign you can have players know what to expect and will design their characters with this in mind. If you do this all the time however this might eventually create resistance from your players, who'll want you to change this or, perhaps for the best, have them give it a shot at DMing.