Use the following trick to determine how fast the curse eats Spirit Points and give you penalties. Note: This procedure requires editing a game file; creating a backup copy of the file before proceeding is recommended. With a text editor, edit the "global.xml" file in the "\my documents\neverwinter nights 2\saves\" directory. Locate the following lines:
Change "1.000000" to "0.500000". This is the lowest valid value. Do not change the speed a lower value or it may break the game. Immediately below this entry you will find the "SEPoints" value. This is your current spirit points, and its maximum value is "100.000000".