This mirror was called the Dreamscape. It resembled an ability Green had once relinquished in order to save Vivian.
"Kekeke... All you need to do is hold a stone at midnight, turn twelve circles before the mirror, and you can summon my descent, granting any wish whose price you can afford..."
In a low, hoarse tone, Green used dream guidance on the creature from that distant foreign realm that had obtained his Devil Contract but refused to sign it.
Anyone who acquired such an apparently wonderful contract would likely be wary of it.
Yet, from Green's observations, his Devil Contract had likely passed through many hands after falling into this world—perhaps even drifting among different groups of people—yet no one had ever entered into a contract with him. This made Green suspect that his Devil Contract had suffered some damage when it passed through the gaps between time and space and fell into this distant world.
In other words, the Sacrificial Descent Grand Sorcery had only been half completed.
Thus, Green immediately began trying other methods of communication.
After paying a certain price, Green obtained this mysterious communication technique from the Book of Knowledge at the Two-Ring Holy Tower.
Through the Dreamscape, Green repeatedly implanted methods of communication into the subconscious minds of those holding his contract. Perhaps one attempt, two attempts, ten attempts, or twenty attempts would not suffice after the losses across distant time and space, but so long as he continued this subconscious conditioning, this being—presumably only a low-level creature—would one day turn it into instinct.
Fifty years later.
Using relative spatial folding and Distortion sorcery, Green imitated the structure of the Dark Matter Reactor aboard the Void Motherships of the Metal Destroyer Civilization, opening a tiny hole within his body that led to the void