Military action
Waterdeep is taken in a siege of the city and occupied by strange creatures and men from a far away land.
A horde of creatures, including snake people, tainted dwarves, ogres, and even fiends surround the city. The city fought its hardest, and its defenses managed to actually fell most of these creatures. Unfortunately, at the same time, Titan agents who had already infiltrated the city assassinated specific intimidating individuals, including the Blackstaff. The Titans then moved there forces upon the city. Their longships blockaded the docks while their legion moved to surround the rest of the city. At this point, the Titans waited. The city was in disarray with every guild and faction bickering over what to do. Finally, a large majority of what have now been identified as Zhentarim agents working as Masked Lords convinced the open lord to surrender the city to the forces after they started to run out of supplies.