At first she's surprised at his interest, but then she realizes that few have actually witnessed her using these spells in person, and that there would be some questions about how it all came about.

"Well, it started at Skyhold. The library there has these positively ancient books, and there were some detailing how to build your own spells for specific purposes. First you have to find a sort of... category that the thing you want to do can fall under. So like, for example, I wanted to become invisible, and to do that I found I needed Fade energy to surround me. It's actually similar to Fade Cloak, so I used that as a starting point, and built the spell up from there. I added the ability to be completely silent while invisible, and I can create a Fade copy of myself to distract enemies."