Di Xiu transmigrated, becoming a gray rat in another world. Not only must he build a protective dungeon to safeguard himself and his race, but he must also constantly guard against invasions from other races. Humans, gods, demons, monsters, dragons, elves, ancient taboos... even outworld gods coveting the world! The former order crumbles, and the apocalypse topples the towers of civilization. In the face of life and death, Di Xiu comprehends the truth of magic. Magic is not chanting, but a rigorous set of underlying world protocols! Only with the correct logical framework can it be safely compiled and run. While other mages are still struggling to chant spells with their flesh and blood, Di Xiu is already debugging magic circuits in the dungeon, developing the third-generation gray rat exoskeleton armor, heavy armored mechs, and aerospace carriers... The magical industrial age has begun! The gray rats are building a jungle of steel and gears. Mechanical rats wield precision...

Maurice, reborn, wanted a peaceful life, but a letter from Hogwarts disrupted his plans. Along with it appeared a book detailing various forms of necromancy. Becoming a necromancer? Perhaps that wasn't so bad. Bones as servants, ghosts as companions, the whispers of the dead murmuring in his ear. "I'm just an ordinary wizard who loves research," Maurice said with a gentle smile to his trembling classmates. Until one day, he suddenly woke up in front of the mirror—wait, could he be a psychopath who deals with corpses all day?

"Why create a new Terraria world to connect to the Multiverse Network?" "Because I want to give players in other worlds a complete childhood." "An adventure without encountering giant tortoises and rockfall traps is ultimately incomplete." "As for why we hold a fishing competition during a blood moon… that's none of your business." — Years later, the now immortal [Godslayer Tyrant - Shaper Master - Luo Yi] said this in an interview with a fairytale fairy reporter. ... [Connection to the Multiverse Network successful, loading version information…] [Current Multiverse Network version setting: Great Journey - Card Feast]

The protagonist, now Tom, has transmigrated again, this time to the world of Hogwarts. He's adopted by Luna and becomes part of her family. Tom, who thought he could only attend classes after his owner enrolled, receives an acceptance letter from Hogwarts on Luna's tenth birthday! Thus, a resilient, mischievous cat with some strange abilities enters Hogwarts as a student. No one knows what changes his arrival will bring to the wizarding world. (Updated at 12 PM as usual)

Edward traveled through time again and came to a mysterious world.

From then on, there was a stranger here who could travel between the two worlds regularly.

So, what will he bring to both worlds?

ps1: This book is a traditional fan work and will not completely abandon the original characters to tell the story. The heroine is Miss Justice, and she may join the Queen later on.

ps2: The path of the protagonist of this book is semi-original. He takes the path of [Apprentice] in the early stage and starts to change in the middle stage.

ps3: The protagonist is basically invincible in the same level, but he can't kill high-sequence enemies.