@TheEdVerse
Do the lords or captains of Waterdeep have access to any last-resort defenses for the city aside from the Walking Statues?

— Alex Rosell (@FireBreathShark) June 17, 2019

2)
1)
It depends, in YOUR Realms, how much survived the Spellplague. There are huge sections of massive city walls waiting extra-dimensionally to be whisked into place, there are the griffon riders in their eyrie within the top of Mount Waterdeep and the various…'bombs' they can drop on besiegers/invaders from aloft (including opening-caged monsters of various sorts), and there's whatever the Blackstaff and the Watchful Order have up their sleeves. Not to mention various "family relics" that various noble families…#Realmslore

— Ed Greenwood (@TheEdVerse) June 18, 2019

4)
…3)
…have hidden away in their mansions. Some of these are known to include shield guardians, golems, and an astonishing number of undead beholders. Not to mention ‘sleeping’ family members who are liches of some magical might.
Those city wall sections, BTW, have. at least twice in the past been dropped on the heads of attackers riding large monsters, rather than put in place to form a city wall.
And, oh, yes, there are all the dragons (see my Wyrms of the North articles) resident in Waterdeep, in various guises.
Plus…#Realmslore

— Ed Greenwood (@TheEdVerse) June 18, 2019

5)
…whatever Laeral, the current Open Lord, can call on personally (not to mention the head of her secret service, a certain Elminster; you may have heard of him). Both Laeral and El are weavemasters; they can call on the Weave to do all sorts of magic without casting spells.

— Ed Greenwood (@TheEdVerse) June 18, 2019