So you call yourself a hero, do you? Care to test that against someone who loves nothing more than corrupting the purest hearts and noblest intentions? Baron Brimstone was a hero once, under a different name and in a very different lifetime. He finally embraced the darkness and is pretty sure he can get you to do the same. And if he can't, well heroes die just like anyone else when you know their weak points ... and the Baron excels at finding those.
Baron Brimstone is a PL 12 threat to add to your Mutants & Masterminds campaign.