After organizing all the vast pieces of information he had received from the Universe's Fate, he figured that there were different ways to create the Chaos Obelisks.
There were different blueprints of Chaos Obelisks in his mind, and given their unique characteristics, they all came to the conclusion that it was fine to construct the Chaos Obelisks below the surface.
"This Chaos Obelisk is literally called Cave Chaos Obelisk, who the hell would label it like that and ask for the Chaos Obelisk to be placed on the surface?!" Kathrine had shouted at the end of the debate, while Sven had added a small comment to her exclamation.
"Furthermore, Dilan has been requested to construct them as far as possible from one another. It would be weird to give Dilan the opportunity to build underground Chaos Obelisks if the Universe didn't actually want him to take this path. Let's just play along…"