Painkiller-induced idea for how to add more Lovecraft vibes to your Pathfinder game, while also balancing out martials and casters.
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10% of everything with a CR you encounter is Noisome and Disquieting. (The GM should get a list of Lovecraft Adjectives, or Lovecraftives, so as to easily describe these things.)
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When encountering them, you must make a Will or Fort save (whichever is better for you). If you fail, you gain a negative level and take a -5 penalty to your attack and damage rolls and save DCs for 1 hour. The DC for this save is 15 + CR.
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If you fail this save by 10 or more, the GM gets to run your character as a madman for 1 round per CR, or slip you a note about a new (crazy) objective you have picked up and aren’t telling anyone about.
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Because magic is dangerous and full of knowledge that can blast your inner self, your save against Noisome and Disquieting things takes a penalty equal to the highest level spell or spell-like ability you can cast, plus -1 for each supernatural ability you possess.
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fini