Sora will open a closet in his bedroom - which, by the way, is rather messy, as he seems rather content to leave most of his dirty clothing on the floor until it's washed - revealing that the closet is lined with shelves rather than clothing. The tiefling looks over them briefly before picking a single book off the shelf, and moving to hand it to Riss. The cover says Lhena's Extracts in gold handwritten font, and the tome is bound in red leather. It's fairly thick, but not too thick, and has that musty quality that books that have been sitting too long in a library have.
"You were interested in magic before, obviously. Lhena was an archmage and teacher, and she was particularly interested in making sure that the people who came after her would learn magic properly. It's the first book I used when I was learning magic, and it describes magic as best you can in a succinct but accurate way."