The four realms are: heaven, earth, man, and harmony. Heaven conquers the earth, earth conquers man, man restrains harmony, harmony conquers heaven, and so on, creating and restraining each other. The story is caused by the massacre of the immortal clan in the heaven by the shaman clan in the world, and then the immortal clan sent Haotian to the earth to contact the emperor of the human race to form an alliance. The demon clan of the earth realm also sent Huang Tian to form an alliance with the witch clan of the realm...