The True Creator? The ravings that fill these waters come from the True Creator? Upon hearing Queen Mystic's answer, Klein was surprised while feeling somewhat joyful.
He was rejoicing because, just as Queen Mystic said, if she hadn't boarded the ship, Heath Doyle might've undergone a mutation even with the existence of a Sealed Artifact which could reduce his auditory senses to a certain effect.
Towards Low- and Mid-Sequence Beyonders of other pathways, they would only feel repressed and frustrated, or they would occasionally suffer from nightmares when faced with the True Creator's ravings without actually listening to them. But to a Rose Bishop, the Sequence 0 for his corresponding pathway was the True Creator. To be immersed in the ravings of this evil god, even if he was deaf, something would've happened to him sooner or later.