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After encountering the book you should find a new quest in your inventory (ALT+Q) to collect 1 Dark Gem Stone Of Courage, 1 Dark Gem Stone of Time and 1 Dark Gem Stone of Resurrection and return them to the book.
Find the NPC Magician in Randol and talk to him about the gems and you will receive a quest to acquire 14 Dark Orbs and 17 Mist Eyes and bring them to the Broken Moonstone Golem, another NPC in Caron, Merac.
Finding the orbs and mist eyes is not difficult, it just takes a lot of patience; the dark orbs can be found in monster drops left by all types of Orcs in the Prokion Temple and by Dark Goddesses. Mist eyes are dropped by Poison Mysts.
The Golem you just dealt with should now issue you a quest to get him 3 Perfect Moonstones. Perfect Moonstones are pretty rare in the game so the easiest way to get one is to combine some lower level ones, but that's not always a guaranteed a success. You can buy moonstone combination boxes for the general stall vendor, and remember the higher the grade of the box the higher your chances of success.
Once you've done everything the Golem wants you need to find the Great Magician Minearm, also in Merac, for a new quest. The Magician will tell you to collect 77 Black Diamonds to give to another NPC - Spirit Magician Heras in Aaron on Eghea.
You can acquire Black Diamonds through processing Quality Stones. Be warned; it costs 6 Quality Stones per Black Diamond and it's expensive!