Introduction: A man is summoned to a world to become a dungeon core. With no memories of his past life, the newly reborn dungeon core is confronted by man wanting to make him part of a system. However, the next thing he knows, he''s whisked away again to another world, this one full of high-tech magical stuff. It turns out that the man he''d encountered is apparently a tyrant bent on controlling several worlds and sends demons to bend those worlds to his will. After choosing the name Null for himself, he finds himself thrust into a world as a dungeon core without a clue of how to be a dungeon core. Fortunately for him, once he gets his feet on the ground, he''s able to join the dungeon guild, A whacky collection of dungeons fulfilling tasks to make the world a better, less demon infested place. In this world, dungeons can utilize the demon cores dropped by demons to do stuff. And that stuff is useful. Thus, existing alongside the Adventurer guild is the Dungeon guild.  I hope you all enjoy this novel.Cover art was created by DALL-E. I''m not a good artist....