Be Afraid of the Bark! Tree Rex from our Skylanders Giants Birthday Cake – Tree Rex and Eruptor on their Portal of Power! When I started to make Tree Rex I found that I ended up making over 16 different pieces to construct him, Eruptor was much more ‘cake-decorator-friendly’ as this little chap was made up of seven pieces. I have a feeling that these two sugar models will not be eaten by the two birthday boys for a while!