The Stockwood Scrolls
Beyond the Iron Gates
This tome was found amongst the belongings of the Red Wizard Rath Modar aboard Skyreach Castle. Written entirely in Infernal, it describes various forms of devil summoning, but the final chapter describes the use of massive summonings and the sacrifice of hundreds of souls to bring Tiamat bodily out of the Nine Hells and into the world. The details of the ritual make it clear that this is something that requires enormous preparation and expense, but the actual magical formulae and chants are not given in this volume.
The book was quickly looked at by Glinda, but she quickly discovered its evil and closed the tome. It has travelled with the group ever since, and it was dramatically shown to the Council of Waterdeep to emphasize the real danger of Tiamat’s return.