Because you [Ardeth] also produce strong Shanir, as we know to our grief from Pereden. Because his son may also be a dream-stalker, as well as a charmer. Because he's already snared a Kendar girl with his glamour and bedded her. We all know what damage that can cause, and how many Kendar Pereden ruined.
– Hawthorn, To Ride a Rathorn, "Chapter XII: Unsheathed", V
Charmers are Shanir, mostly from the Ardeth. Pereden was a charmer, as were his sons. They are very persuasive, almost addicting, and people can often literally not refuse them.
↑ 1.01.1Bound in Blood, "Chapter X: Noontide Ghosts", I — " 'D'you think it's that easy to say "no"?' Jame started to say 'yes,' then hesitated. Beyond his natural charm, Timmon possessed a Shanir power that she didn't fully understand. Probably he didn't either. He had certainly never felt the need to take responsibility for it, any more than his father Pereden had before him."
↑Honor's Paradox, "Chapter XVI: Tests", II — " 'A white for diplomacy,' he said proudly. She laughed. As practiced at Tentir, diplomacy and debate were closely linked, with the hitch that one truly had to convince one’s opponent. 'You’re a charmer. What could be easier?' "
↑Honor's Paradox, "Chapter III: Pyres and the Pit", I — "The Ardeth Lordan was a charmer, a dream-stalker, and a would-be seducer,"
↑Honor's Paradox, "Chapter III: Pyres and the Pit", II — "Who but Drie, she thought, could do things his own way and get away with it? Come to think of it, whatever the lesson, she had never seen him do anything except water flowing, and no one had ever called him on it. After his own fashion, he was as much a charmer as his master Timmon."