[X] Question the servants of Tiamat captured in Oldtown.
-[X] Utilise the full array of avaliable effects - Dominate, Brain Spider, etc. Learn everything Lormar and his apprentice know of magic, Tiamat's forces, various places of power and treasures, what they know of any intrigues, their knowledge on magical (and political) powers other than Tiamat, waht they know of situation in Yi Ti, True Names of Outsiders, etc.
--[X] Have Lormar transcribe his full knowledge of magic under effects of Dominate, not unlike that Tyroshi cultist, whose knowledge now helps Inquisition to root out Daemonic cults.
---[X] Once Lormar is drained of all knowledge avaliable, have him bottled again. He is too much of a danger to offer same clemency that is offered to regular cultists, and letting Bitch Queen get his soul would be too dangerous.
--[X] Question Abishai on all True Names it knows, all it's knowledge of magic, everything about forces and intrigues of Tiamat, on political/magical situation in Yi Ti, what it knows of other magical (and political) powers on Planetos and outside it, etc.
---[X] Learn in great detail how exactly was the faith of Seven subverted by it, what methods it used, what ideas it implanted, and ideally have another guide-book for Inquisition compiled based on these notes, helping in finding and rooting out anyone using the same methods, or at least allowing to spot centres of such subversion when acting in regions outside the Empire.
--[X] Once Abishai is throughly questioned, have it bottled again.