The contract backfired and his natal spiritual beast was taken away. Ye Xu became the laughingstock of the sect and was thrown into the Cave of Ten Thousand Beasts to die.
Little did he know that he had awakened the ancient "eternal life contract" - others contracted a spiritual beast to lose their lifespan, but he contracted a spiritual beast to share eternal life, and the spiritual beast became stronger as it died, and automatically evolved back to its ancestors after death. A mortal dog resurrected from the dead tree, and when he opened his eyes, he became a sun-devouring divine wolf; a dying weed spirit on the roadside instantly transformed into a tree reaching to the sky.
So, when the old enemies came to kill on dragons, phoenixes and unicorns, Ye Xu was followed by a sea of beasts: the immortal divine phoenix acted as the dawn chicken, the ancient thunder dragon used to guard the door, and the fat orange squatting on his shoulder had just swallowed the way of heaven in one bite.