This was also a good reason for our group to get into a lower-magic campaign. I like powerful heroes in the campaign, but at the same time I want to limit their ability to influence it.So... how do you deal with the 'uberest' NPCs in your campaign? Limit NPC level, keep high level NPCs busy with 'broader' problems, transform high NPCs into gods or demigods (& ship them off to another plane in the process), what?