The Witch God Sect invoked the Heavens and Earth with sacrificial methods and was favored by the Will of the Heaven and Earth. In return, they were bestowed with True Immortal Dao Fruit.
However, just as their grand achievement was within reach, the Scarlet Tiger King, a Supreme Strong of the Demon Race, descended alongside two other Supreme Strong from the Demon Race, obstructing the Witch God Sect from attaining enlightenment.
Furthermore, because the Witch God Sect's sacrificial method was relatively simple compared to other enlightenment methods, the Scarlet Tiger King saw how this way of enlightenment could endanger the Demon Race. Thus, he rose with the intent to eradicate the Witch God Sect and erase the method of becoming a Dao-Certifying True Immortal.
Yet, this move further enraged the Witch God Sect, which harbored deep-seated hatred for the Demon Race, leading both sides to unleash a world-shocking great war, deploying their various methods.