Voren'thal the Seer in Shattrath City wants you to obtain an Arcane Tome. Performing quests for the Scryers will cause your Aldor reputation to decrease. This quest starts and ends in Shattrath City.
Upon completion of this quest you will gain 2 600 experience, 350 reputation with The Scryers and Arcane Rune.
Here you can buy Synthesis of Power Quest Boost for EU or US Servers.
You'll get guide for completing Synthesis of Power Quest Boost