2. They do have things of that nature. Really good anti-grav devices take a lot of energy so their shields aren't the best for the most part but they can hover, zip around quickly, and unleash death and destruction down on enemies in spades. Some expensive generators could power great shields and anti-grav but your monster wouldn't be fighting the really good vehicles unless he upgrades later. Even a 100 foot monster would be quickly reduced to toast unless he was magically enhanced or skin made up of some made up biological material to withstand orbital bombardments.

4. The main npc's will probably be able to kill a lot of them in cool fashion.

6. I'll try to get people too.

Poisonous