The insanity rules in CoC have always been woefully indequate to the point of being practically unusable in an actual game. I just downloaded Book of Broken Dreams (at RPGNow from Netherland games who also did Primal Codex) and it looks like it has great potential - particularly for npcs. For short-term effects on pcs in CoC, I think I'd want to use the fear/horror/madness rules from Ravenloft. Broken Dreams also has some terrific - but subtle - spells and three very interesting prestige classes.
And if you are looking for inspiration for a dark psychological setting for a CoC game, check out the movie Quills.
And if you are looking for inspiration for a dark psychological setting for a CoC game, check out the movie Quills.
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