Ninefold Heavenly Eye

I Read a Xuanhuan Novel but Forgot the Title. Help Me Find It

I read a novel where the protagonist had a companion who was a tiger that could devour things and grow stronger. In the end, it became the villain's boss. For the final battle, it used a skill that made both sides return to their childhood forms and fight. After it lost, it went to another plane and invaded it, and the protagonist went looking for it in that plane.