Beast Tamer World

You just recently graduated from high school and split up with your friends who you all promised to meet each other again after becoming great beast tamers. This world is full of beasts! Fire, Water, Nature, etc. Every beasts have stages of mutations. However, there's a second path to mutations, humanoids. Once a beast reach the needed requirements, it can mutate into a humanoid which can in with the humans and have more powerful abilities. What do you want to do first?