The two books from the two Castles Etruis went to.
The First Book[]
The first book appears in Castle I and the first book maybe telling directions of the second
Castle.
The Second Book[]
Dr. Romanov reads it and gets a translation of "The Wise One's" writing on the wall which was in the altar room. Also it told directions of the third castle.
Trivia[]
- The First Book was a green book in the "Castle I" animation/episode, but later on it was retconned to be the color red to avoid confusion of the two books both being green. As shown in the Castle III Part A Main Menu, Etrius holds both the books, with flashbacks of his events for Castle I as shown in 3A too.