I had a thought for an Epic feat that would cause saves by others caused by the epic level character to not automatically succeed on a 20.
So Luigi casts against Saladien, who can only make the save on a 20 because the DC is 32 and his save is only +10. If Luigi has this new feat, than the 20 by Saladien does not auto succeed.
This could also apply to other saves caused by effects other than spells.
Thoughts?