I may as well throw my idea in as well x:<br/><br/>Playing off of the idea that even good men go bad in Havenlock Prison, and the recent boost in crime, perhaps  there is an evil or twisted shrine beneath that lays beneath the site. Hux discovered it not long after becoming warden there, and was enthralled by the other worldly being or God that it is host to. The approaching army have discovered this shrine - via a leak provided by one of the guards (or whomever would be most appropriately) - and believe Hux isn't using it to its full potential. They wish to  cleanse the site of Havenlock and then use the power housed beneath for their own gains. Their army consists largely of Drow and Drow-Blooded Half-Elves, as well as the occasional Half-Orc.