First Generation Vampire

Someone who traveled through time discovered that he seemed to fit the characteristics of a vampire. But the problem is, there is no record of the vampires in this different world! Am I the first vampire in this world? Without guidance from seniors, There is no system to help. In order to understand the settings of vampires in this world, he had to constantly observe and record his body's reactions in various situations: [Under direct sunlight, strength has no effect...] [The throat, heart, and brain are no longer fatal weaknesses...] [Without eating, drinking, or even sleeping, one can survive and maintain strength without blood...] [It can suck blood from the air, atomize it, turn into a bat, pass through walls, and turn into a shadow. The more blood it sucks, the more powerful it is. It can also take other people's lives as resurrection coins...] PS: The main plot of this book is the struggle for hegemony among lords. The identity of the vampires is just a golden finger that can be continuously developed, so do not enter with caution.