Victim said:I think that most intelligent epic opponents (IMHO, all of them) will either have see invis up all the time or they are suicidal or have some secret plan that involves inviting people to attack them.
Look at just about all high level outsiders and dragons - most of the high CR opponents. They all have fun ways of beating invisibility.
Also, later on today before my game session starts, I'm going to be pricing out various See Invisibility items for our 10 - 11th level group. After a battle in which every combatant was Improved Invisible, and after the first round only 1 person (me) on the adventurer team could see invisible. Playing air traffic controller sucks. "All personnel, please delay: your destination will be illuminated via Flamestrike momentarily. Fighter_1 please come about to vector . . ."
*snatches Victim up in his talons*
Hmmm...you were made for this day.
*eats him*
Bwahahahaha!