Hao Ren tried to describe what he heard in the illusion as far as he could, but he had difficulty to put what he learned through some 'transcendence' into words. At the moment when the deicide murdered the Goddess, there was a tremendous amount of information pouring into his mind. He was unaware of anything at the time, but the information began to emerge from the depths of his mind to make him realize the entire process about how the innate hostility came.
He roughly described it as "the evil had distorted and tainted the blood of the Goddess, and the catastrophic power leaked from the blood of the Goddess had also tainted the Wall of Reality, leading to the distortion of the otherworldlings that arrived in the surface world through the Wall of Reality." As for how this process happened, he could hardly express it in words.