The Voice of the Thorns is, or was when I met it, a talking ball of fire. It was jumping about the forest looking for something. When it got too impatient, it just started the fire with itself, I imagine. No further magic needed.

[Since seals are probably some kind of magic. At least, that's what she's going to figure.]

That's not all, mind you, but that's the basics. Let's meet over coffee. [A sigh.] Or tea or whatever the hell these bastards have. We can chat all about it, Sugar.