The moment Isaac made his move in the Mysterious Void, the Black Orc God knew who he was. Of course, this wasn't about Isaac's true identity; rather, the God recognized him as the little thief who had stolen from him last time!
After all, in this day and age, while there were still plenty of Mad Witches, Ancient Mad Witches who dared to steal from an Outer God were few and far between. At the very least, an Evil God like the Black Orc God, who wasn't averse to trading with Mad Witches, hadn't encountered such an ancient one in several hundred years.
That's why the impression he left was so profound. And even though the God still didn't know Isaac's true identity, its intuition screamed that this was, in all likelihood, the same person!
And when it saw what Isaac was after, its fury surged!
Because his target was its remaining Forbidden Knowledge—Skeleton Magic!
You ask why it was its *remaining* Forbidden Knowledge?
