Prayer book

Prayer book
Released							6 March 2007 (Update)
Also called							Prayer of Deliverance from Poisons
Members							Yes
Properties
Tradeable							No
Equipable							No
Stackable							No
Noteable							No
Options							Read, Recite-prayer, Destroy
Destroy							This book is old and delicate. Dropping it here will destroy it and you will have to search the Edgeville Monastery bookcase for another.
Examine							Used to cure poison through prayer.
Values
Value							1 coin
High alch							0 coins
Low alch							0 coins
Weight							0.05 kg
Advanced data
Item ID							10890
Link							MOID

The prayer book is obtained during The Great Brain Robbery quest. By selecting the Recite-prayer option while wearing a holy symbol or hallowed symbol, the player can use Prayer to cure poison or venom at the cost of some prayer points (see usages). This can also be done via clicking the hitpoints orb, though potions will be prioritised. Sometimes, the poison will only be partially cured if you run out of prayer points.

If lost, the prayer book can be reclaimed in the Edgeville Monastery on the ground floor^[UK]1^st floor^[US] on the south-western bookcase. Once the quest has been completed, the book can also be found on the bookcase in a player-owned house under the title, "Prayer of Deliverance from Poisons".

Although this book has a 'destroy' option, it is possible to get more than one copy. This can be done by keeping the book in your bank while you obtain a new one from your player-owned house bookcase.

The prayer book should ideally be used after combat because the monster a player is fighting could poison again, causing the player to drain their prayer points further (to cure poison), and wasting time in which the monster could have been attacked. The prayer book is most effective in activities where prayers are unused and poison effects are spread further apart, such as the Hallowed Sepulchre and cutting sulliusceps.

To calculate how many prayer points it will cost to cure, subtract 2 from the poison damage and divide by 2. For example, if someone is poisoned for 7 damage each time, it will take ⌈7−22⌉=3 prayer points to cure them. If a player only has a portion of the required prayer points needed to cure poison, they will only be partially cured of poison and the remaining few points will be drained.

The prayer book can also convert venom to regular poison as long as the player has Prayer points left. Doing so costs a maximum of 50 Prayer points. If the player has less than 50 Prayer points left, the remaining Prayer points will be used. The remaining poison amount will be the amount of venom damage dealt most recently.

Source	Level	Quantity	Rarity
Bookcase	N/A	1	Always

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  Pages 1-2
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  Pages 3-4