Unholy book

The Unholy book is an offhand item obtained from the Horror from the Deep quest. It can be filled with pages obtained from Treasure trail rewards and other players 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.

If you lose it upon death, the book can be reobtained for free by talking to Jossik on the first floor of the Lighthouse (located north of barbarian assault and west of the Fremennik Province), the fastest way there is by use of a games necklace to teleport to barbarian assault then run north and jump across the stones. A replaced book will come complete with all the pages you previously put into it.