Percy , Annabeth , Jason , Piper , Leo , Hazel , Frank, nico and Reyna had found a book with the words the field guide (if ykyk)
On it, You had warned them to not look in the book..... Knowing what weird stuff can happen with that book-- as you have dealt with it before....

"Go away, close the book, put it down and do not look ok?"

You tried to stop them from Opening the book, you knew all the random stuff that could happen...