How Come I Am Invincible When I Am at the First Level of Qi Refining?

He has experienced three thousand kalpas in heaven and traveled on earth for eight hundred years. The edge of the sword below the waist is filled with purple lightning, and the red flames in the furnace are filled with blue smoke. Just then I rode on a white deer across the four seas, and then rode on the Kunpeng again and traveled for nine days. Xiao Ji and others are chatting and joking, but no one knows that I am a true immortal. Traveling through time and becoming a young Taoist priest in a dilapidated Taoist temple outside the capital city of the Great Zhou Dynasty, Xu Li looked at the evil and strange objects all over the world and felt that his life was hard to save. Fortunately, with the system at his side, Xu Li only needs to kill monsters and do good deeds to gain merit points, and even open the divine pool of merit to obtain all kinds of treasures. Kill the daughter of the eight demon kings in Luo City and obtain the magic mirror. He killed the three guardians under the Demon King's throne in the Eight Prefectures of Luocheng, saved the life of Liu Mei, the Demon Suppressor, and obtained the Boundary Breaking Pill. Kill the eight demon kings in Luo City and obtain... Relying on the merit system, Xu Li unknowingly embarked on the path of demon killing and cultivation, but found that there was no rival in this world. He looked at the cultivation column on the system panel and began to doubt his life: "I am obviously invincible, but why am I still at the first level of Qi Refining?"