The gravitational wave system, to put it simply, is something that arises from the gravitational fluctuations caused by massive celestial bodies or other entities in the universe.
Generally speaking, they move outward slowly like ripples, dissipating in a wave-like energy motion.
Moreover, due to the peculiar nature of the gravitational wave system, it lasts for quite some time without much decay, so traveling by gravitational waves is not something hard to imagine in the universe.
"Lord, the original guardian of the gravitational wave channel has been killed by us, but he seems to have long-distance communication devices. I'm afraid they might call for reinforcements."
