Return of Reckoning

Im in Dwarf T2 and im looking for the hidden quests to get the jewelry sets. I found almost everything i think but I cant find the "Tome of Dark Rituals". Anyone knows where to find it?

Hi, i have a problem since today, i can't login my main character it says that the server disconnected me, but if i login another character it lets me in. This started from a CTD that i had while i was playing