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The Unholy book is a book held in place of a shield, and is the god book aligned with Zamorak. It is obtained from the Horror from the Deep quest. It can be filled with the 4 pages obtained from Treasure Trails to give bonuses and the ability to preach lines from the book at the cost of 25% special attack energy. The Zamorak unholy book is the most offensive book of the original three, giving the best all-around attack bonuses.
Equipping an unholy book allows the player to preach and perform ceremonies, such as blessing, last rites, and wedding rites, by operating it (none of which have any effect on the game itself, and are simply recited lines of text), costing 25% of the player's special attack energy.
Lost unholy books can be reclaimed by speaking to Jossik, complete with all pages that have been added, for no cost. Alternatively, for those who do not wish to travel to the lighthouse, Perdu will return them to players for 12,000 coins.
Filling the unholy book with all pages currently costs 499,672 coins.