Beast Control Era: This Gym Leader Is Too Strong!

Ye Yun traveled to an era where everyone controlled beasts, and everyone had the qualifications to contract a pet beast. As the leader of the Feitian Gym, at a critical moment, he awakened the golden finger. Even if the pet beast can turn black, even his body can turn black! "Your pet unicorn heard your complaints, turned black, and evolved into a unicorn demon!" "Your pet, the Black Duck, heard your complaints, turned black, and evolved into a Dark Duck!" "Your body heard your complaints and turned black. Congratulations on gaining 100% critical hit in the beast control domain!" "..." In the midst of constant darkness, Ye Yun embarked on an invincible path! The introduction is too weak, please read the text, thank you very much! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.