Cesar heard a lot of things about the coins.
It gave him valuable lessons.
Just because humans have made a deal with a Nightmare doesn't mean they are taking orders from them.
They aren't controlled but merely use each other to gain their own benefits.
Still, I think that some of the great things that have been made today had a nightmare, but a benefactor still didn't suit Cesar right.
He can think of many situations that happened in the past that almost took his life because of the involvement of a Nightmare, and there's no doubt that the same situation will happen in the near future.
Finally, he came to the coin that told him one of the most valuable and hidden secrets of the Academy.
The very first instructor of the Academy had spoken inside his mind.
"The deal I will be making is to keep quiet about the existence of the Nightmare that is currently dwelling in the Academy after making a 'pact' with it. This is Ernest Foil, the first Headmaster of the Academy."
