I love that it's a weakness that you can remove while progressing the game but it's too easy for cluevers.

I think this is well balanced for fighters as you can always get help from a teammate... unless you draw it during your turn. I had this in Marion and it was terrifying. In my most recent game I had 5 turns in a row where I draw this during my turn (after playing an event) and I was forced to take a horror and shuffle it back in my deck before anybody could help remove it. I ended the scenario with 1 sanity remaining and this being the only card in my deck. Very scary.