My Soul Contract with the Beast

In the early stages of the dimensional space, the system was in chaos. The souls of mythical beasts can sign soul contracts or life-long contracts with humans. Su Yan spent her life in her previous life summoning the four great beasts to fight against the Titan Python, but was repeatedly defeated. Signing a lifelong contract with the mythical beast in reincarnation. In the reincarnation with the greatest hope of destroying Titanoboa, is it the mythical beast that saves the human race, or the human race saves the mythical beast...