In geomantic omen, what are the positive and negative magnetic fields? Why do some dead animals die together, and it is easy to attract some unclean things? Why a negative magnetic field? ...

There is no magnetic field in feng shui. Feng Shui is about wind, water, sand and qi. When you say magnetic field, it should be close to gas, but it is not. Because the gas stops when it meets water, but the magnetic field can't stop. Qi can be understood as radiation, and it can also form a field. Dead animals dont emit radiation, but sometimes they have a lot of resentment before they die and form evil spirits after they die. The essence of yin and yang is actually very simple, and the characteristic of yang is that it grows upward. On the contrary, it is cloudy. Animals no longer grow hair after death, so they belong to yin.