Oh, really?
I knew Jebm did some Tengu stuff, but I didn't think he had a full Sponsored Magic.
Anyway, here's my take. I'm not completely happy with the wording, but I think it's usable.
TENGU MAGIC [-4]
Description: Drawing on the power of the Tengu Court , you're able to cast spells that fit its essential nature: wind, illusions, stealth,and mischief. These magics are under the sway and watch of the Tengu King Sojobo; making use of them will inevitably catch his notice.
Sponsor: The Tengu King and his Dai Tengu Nobles.
Agenda: Finding of worthy opponents and engaging them in a one on one duel or in general combat. Protecting forests and mountains from both mortal and supernatural destruction, taking vengeance for insults and perceived wrongs, and destroying or subjugating opposing Youkai clans and courts.
Evocation: Tengu Magic evocations take the form of various ninjutsu involving veils and powerful gusts of wind.
Thaumaturgy: Tengu Magic rituals may be used to curse people, especially with disfigurement. Poisons, illusions, possession, telepathy, item creation, and general mischief are also possible.
Evothaum: Tengu Magic rituals can be cast with Evocation's speed and methods if they create illusions, allow telepathic communication, inflict poisons, or target mortals who are enemies of the tengu.
Extra Benefits: A character with Tengu Magic receives the Pack Instincts Power for free, with the tengu as their pack.