Oberon is Tanya's doberman that leads her to so many problems in the trilogies. In the first book thirteen treasures Oberon chases a rabbit into the woods. Harmless, until Tanya and Fabain chase after Oberon. Instead of finding Oberon they stumble over the antagonist Morwenna Bloom. If Oberon hadn't chased that rabbit none of that part of the story, or really the rest of the story would have happened.