I finished The Sunless Cell with only two cursed thrills killed. So, I had to do all The Sunless Cell again, without dying, to kill the last one. I can´t believe I did it!
Images:
http://1.bp.blogspot.com/-Z9C-AxYacmA/VmPFkUDuH4I/AAAAAAAADcc/zPt3Bcb-7DM/s320/20151206_022157.jpg
http://3.bp.blogspot.com/-RLw2P5IPW1I/VmPFiRtYTSI/AAAAAAAADcU/WlqsqI49mj8/s320/20151206_022112.jpg
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Just load up the enemy of my enemy. Much easier.