"I can do a lot of impressive things," he said, still amused. "But to be more specific, there's a certain level of understanding of how living creatures work, and the deeper your understanding, the more you can do. You remember I helped you sleep, once, right? That's part of that general understanding. I have a pretty deep knowledge of that sort of magic, because for some time I was working very hard to get that knowledge so I could heal my sister." The one he'd suggested she name the tree after, at that.

"Actually, I've never taken on the form of another sort of living being. But I know I can do it. The knowledge was just... incidental to learning what I really needed to do."