I Am a Wizard. Is It Normal to Know Some Forbidden Arts?

In the era of universal magic, the game world has arrived. Not only are there a large number of monsters running rampant, but there are also a large number of copies and secret realms in the wild. When Gu Changge woke up, he found that he had become a Muggle wizard. Zero magic talent! At this moment, the system awakens! All of his magic spells mutated into weird forbidden spells! [Calling the Gods' Protection Spell] mutates into [Outer Gods Arrive], summoning projections of evil gods from outside the realm! [Avada Kedavra] Alienation [Indescribable Whisper], the group deprives life power! … Accompanied by weird and chaotic whispers. Gu Changge's figure slowly emerged. "I'm a wizard..." "It's reasonable to know some forbidden arts, right?" …