Sam, Heather, I finally found it! I finally found a ritual that will cast out Pyramid Head!
Here it is.
Ritual of Casting out the Angel.
If thou would cast out the angel Thou must obey the Holy Arcana. To find the twenty-two that they be called The Holy children of Baphomet.
The first Arcana:
To make thyselves holy Thou must find the four points. 0, 1, 7, 12 One shall shed his blood on the blood of twenty Who the twenty shalt give up weapons To eachest form thy first blade.
The second Arcana:
To form thy first blade: Magician let thy blood over guilties blood and weapon. Chant thy words "sicut in caelo et in terra" So that blood and weapon may conform into one.
The third Arcana:
Thou must hangeth the twelfth. Hang her upside down from thy tree. With words of meaning Zero stab the twelfth with thy first blade.
If this be done thou all but one must faceth thine own Hell. If thou can maketh through one day Thou four points be cleansed. Thou four points be ready.
The fourth Arcana:
Three days the twelfth must hangeth While zero finds eighteen. Six on First Seven on second Six on third. Zero bringith back thy weapons and blood To one repeats the ritual of the second.
Three days the twelfth suffer by thee weapons That contain thy guilt and innocence. Three days thy company experience trial.
The fifth Arcana:
On day three, thou zero removes the blades from the twelfth. Thou givest them to the one. Chant thy words: "absuelto su culpa." Over all thine blades. To formest one final weapon.
The final Arcana:
Seventh, victorious over all. Take thee final weapon. Summon forth the angel. Engage in battle with child of fire Drive thy blade through angel's weak spot.
If this be done By the mystery of the arcanas The angel will be cast out and all thy trial shalt be over.