Seeing Teacher Mei was still a bit difficult.
In his previous life, due to the Demonic Sect Enchantress's indiscriminate killing, Lu Country was extremely wary of the otherworldly visitor, Mei Yingxue, let alone allowing her to participate in theoretical research.
Now that the Demonic Sect Enchantress had been subdued and had no bad track record, Teacher Mei was not as closely guarded as she had been in the previous life, so after several layers of approvals, Yan Yu finally got the chance to visit Teacher Mei.
"Thunder Method does not fall within the Five Elements," Mei Yingxue replied after listening to Yan Yu's inquiry, "Heavenly Gang belongs to fire, indicating the Thunder Gate. River Leader belongs to water, whose opposing element is the Rain Sash, also known as the Earth Sash. To summon lightning from the earth, one must act in accordance with the opposing force of Heavenly Gang."