Learning magic from an apostate mage, now that was something, ah...interesting. They had never received any formal training themselves, they had to learn how Emma must have beforehand - on their own, trial and error, experimenting. They shunned the Circles which, dependent on location, made sense - but Dorian knew that Trevelyan's experiences in the Ostwick Circle weren't terrible at all. Perhaps he was sheltered but he had learned well. Either way, he'd be glad to explain theory and the like - he had a rich history of casters in his bloodline, classified as Altus, and had worked up from there.
"The spirits, yes. Ghosts, what have you." The liquid sloshed in his glass, the aroma tickling his nose - she was the first mage he'd met here, this conversation was also tickling him because he just loved discussing the art. "There is no reanimating bodies like what we just saw - we call it, for the Living, the Dead. Meaning that the Maker's first children aid the second. There are actually many writing on the subject in the library, and if I can find the required tools I can show you; you can learn, if you'd like. Once you feel more comfortable with your other areas, that is."
Still, it was a useful specialization - especially here. He wouldn't mind showing someone else.