Fusion
A bright light suddenly shines from Beast and Blackie, their two bodies were now spheres of light that were fusing together. The spheres fuse and in their place, a figure made of light was materialized.
The light slowly goes away as parts of the figure show themselves. First were the legs, Beast's previous green armor was now darker in color as fur could be seen coming out between the gaps of his boots and greaves. His height had changed slightly as he was now about 10 cm taller compared to before.
His arms also got black fur, coming from the hands till the elbow. His hands had also changed, the rugged fingers that Beast had from using his bow for so long were no longer there, in their place longer and thicker fingers could be seen from which long sharp claws were coming out.