Lei Gong isof the Chinese traditional religious and Taoist deity. In Taoism, when so ordered by heaven, punishes both earthly mortals guilty of secret crimes and evil spirits who have used their knowledge of Taoism to harm human beings. Lei Gong carries a drum and malletto produce thunder, and a chisel to punish evildoers. He rides a chariot driven by a young boy named "A Xiang".    - "Wikipedia"


      Lei Gong, The God of Thunder, has many stories about who he is,but the one that stands out the most, to me at least, is the story of how he became the thunder bearing Taoist God he is;

       Lei Gong began life as a mortal. He encountered a peach tree that had come from Heaven, due to the struggle between the Fox Demon and one of the Celestial Warriors, and had become evil. When Lei Gong took a bite out of one of its peaches, he was turned into a human with bird wings. He soon received a mace and a hammer that could create thunder. This is how he became the God of Thunder.