Book: "Crimson Ceremony" is a secret item found in the reading room on the second floor of Lakeview Hotel in Silent Hill 2 and is required for the "Rebirth" ending. It can only be unlocked after completing the game once.
Transcript[]
"Speak.
I am the Crimson One.
The lies and the mist are
not they, but I.
You all know that I am One.
Yes, and the One is I.
Believers hearken to me!
Twenty score men and
seven thousand beasts.
Heed my words and speaketh them
to all, that they shall ever be
obeyed even under the light of
the proud and merciless sun.
I shall bring down bitter vengeance
upon thee and thou shalt suffer
my eternal wrath.
The beauty of the withering flower
and the last struggles of the dying
man, they are my blessings.
Thou shalt ever call upon me and
all that is me in the place that is
silent.
Oh, proud fragrance of life which
flies towards the heart. Oh, cup
which brims with the whitest of
wine, it is in thee that all begins."
Born from a Wish[]

The red board.
In the Born from a Wish scenario, the Crimson Ceremony is not physically present, but represented by a red board used to solve the Acacia Key Puzzle.[citation needed]
In other media[]
In Bloober Team's remake of Silent Hill 2, the item can only be unlocked by completing the game once and is required to obtain the "Rebirth" ending. It is located in one of the graves in Toluca Graveyard.[1]