I took heighten at level 15. I had read some of the comments coming out of Risia about spell penetration being a much bigger thing in the new module and knew that monsters would likely have better DCs with their increased levels. I'm not using it. I'm not finding a reason to use it. When do people who use heighten use it?
Here is my scenario. I have 34 intelligence. I have a spell penetration VII item and all of the spell penetration enhancements (I beat spell resistance most of the time). I have the Stormreaver's napkin (smells like beer). I fail infrequently. I haven't kept track but my success rate with finger of death, banishment, and phantasmal killer is pretty high without using heighten. Would I see something much much closer to 100% success with hieghten turned on?