"I heard it from a retired senior who mentioned it unintentionally many years ago. He said that many years ago, there was a half-human and half-pet creature with a nose more sensitive than a dog's, and it was a top expert in finding Spirit. Among us human strong ones, it's not that we lack people who can compete with tribes or that they are afraid of death and dare not go to the Forbidden Domain to break through. The problem is that Spirits are not easy to find. Often, after half a year of killing and heavy losses, the obtained Spirits are only enough to eat for a few years. It's not mentioned to improve strength, it's good not to go backward."