This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Disrupt the cultist rituals in the Dwarven District, the Park, and the Cathedral District by reading the incorrect words from the Book of Incantations.
Now that you're familiar with the ritual, it's time for you to perform it in the city. Dozens of our brethren have already infiltrated the city and made their way to the ritual sites.
I want you to visit the portal ritual sites in Stormwind's Dwarven District, Park district, and Cathedral Square. The teams there will have made most of the preparations and all you need to is read the last part of the incantation from the book.
Very soon, <name>, Stormwind will find itself awash in wind and water.