This is the best of times. Wizards, fresh from the Second Wizarding War, have entered their golden age. Countless wizards, aboard floating cities, have embarked on a grand voyage across the astral plane. But this is also the worst of times. The battlefield holds not only victors but also countless corpses fallen before victory. The flames of war have been ignited; no one can remain uninvolved. I am Gawain, an ordinary wizarding apprentice, but deep within my soul lies a scale of truth. As long as the scales are balanced, failed potions can be transformed into successes, incomplete knowledge can be filled in, techniques on paper can be mastered in an instant, and even the flesh and blood of nameless ancient gods can be refined into their essence… In this magnificent era, I will ultimately become the one who leads the way.

[A non-human protagonist + the Fourth Calamity + farming management + behind-the-scenes plot + group portraits + search-and-fight] Le Ang, caught in a summoning ritual by a descendant of a noble, travels back in time as a gray rat hiding in the basement of a noble mansion, unexpectedly gaining the ability to summon players from Blue Star. Upon seeing the virtual reality game's realism, the Blue Star players, whose consciousnesses were summoned, become obsessed with their respective in-game characters—rats. As the game planner and the NPC boss to the rat players, Le Ang, while expanding his power through the supplies brought back by the players, learns extraordinary knowledge of this world from the descendants of the nobles... Gradually, Le Ang discovers that he has mastered alchemy. He transforms the frail rat players into his own creations. Flying squirrels with bat wings, muscular giant mutated rats...

Humans kneel down to worship corpses, gods rot and whisper, and wizards search for the secrets of decay in madness.

Edward opened his eyes and became an apprentice candidate in the dark wizard world.

However, his low mental qualifications caused him to be deported from the wizard academy in less than 3 months.

Fortunately, Edward awakened the [Disorder Detection Technique] that can dig out hidden information, which made him notice that the mushrooms in this world have unlimited evolutionary potential:

from [mycosac weapons] lurking under the skin to [mycosac horn] parasitic on living bodies;

from [zombie spores] that control insects and ants to [mycotic chimera ants] that absorb high-quality genes from the body;

from [rotten feast fungi clusters] that grow infinitely by absorbing nutrients from corpses to [scarlet corruption] that corrupts and infects all existence;

many years later, Edward, who is known as the [Mushroom Duke], looked at the latest experimental [green-skinned orcs] and couldn't help but fall into deep thought:

"No, what are these fungi doing over there?"