Loads of demons can teach their ‘masters’ how to persuade people to share their point of view. Or there’s a great course at the University of Waterloo.
Forneus also has this ability, though I don’t know if he’d do better than Dr. Smith. And even though tuition is a monster, it’s not quite as much of a monster as Forneus. A sea monster to be specific.
You can tell people who are in league with Forneus because you’ll suddenly think how great they are, and so will everyone else even if they originally hated the guy. Also, they will know a bunch of languages without any study.
Forneus is a marquis who oversees twenty-nine legions of spirits.