Make a Contract with Medusa at the Beginning and Bravely Venture into the Parallel World

Have you ever thought that there is a parallel world outside the world you live in? In that parallel world, there are alien beasts with extraordinary abilities. For example, the nine-tailed sky fox in Samsara Mountain, the frost dragon in the extreme ice land, the ghostly six-eyed and four-armed ghost king, the colorful divine deer in Fenxia Valley... Because his parents disappeared a year ago, Chen Ye accidentally discovered a large amount of information about parallel worlds and an alien egg in the secret room of his home. Only then did we realize that humans had rescued someone into it a hundred years ago, and within a hundred years, a new civilization belonging to mankind had been formed. Driven by curiosity and with the purpose of finding his parents, he embarked on a journey to a parallel world alone. On the first day of arriving in the parallel world, the alien egg hatched! A strange beast with a body and tail appeared in front of Chen Ye, and by chance, he knew its identity. It's Medusa! It's Medusa with ancient bloodline! Chen Ye contracted with Medusa without hesitation and started his own journey as a spiritual master! In the past hundred years, humans have created spirit cards that can enhance the combat effectiveness of pet beasts. There have been plans to study the resurrection of ancient pet beasts, and there have been experiments to study the fusion of pet beasts...