Prayer of Deliverance from Poisons.
Being the full and proper prayer against morbidities of the flesh caused by venoms and potions of both a natural and mystical origin.
Take up your blessed symbol of Saradomin, cast in silver. Hang it about thy neck, where all may see it and thus know of your devotion.
Pray in a loud, clear voice to Saradomin for relief from that which ails you. Appropriate calls for aid should be accompanied by a sacrifice of Prayer energy, with deadlier venoms requiring a greater sacrifice.
Should the supplicant lack piety, they will not be cured.
Should they posses a measure of piety equal or even great than that which assails them, the poison will be reduced or even cured, while a like amount of Prayer energy will be taken to do this.
Be wary: should the supplicant only partially remove the venom through the application of prayer, their body must still bear the brunt of its wickedness.
Also... (The rest of the book seems to have been vandalised, charred and slightly bled upon.)