By using this trick, when your character gains a level, you can redistribute already spent ability points. Spend all ability points on the stat you want to reduce, then use the "Reset" button. Go to the stat which you added the points to, and you can now reduce the number of points in the stat by 3 (the number of points you spent in it before hitting reset). These extra stat points will be added to your available points and can be spent on any ability. There are a couple restrictions. This can only be done once per level, you cannot reduce the stat by more points than you spent in it, and you must spend the points in only one stat.