Skyscraper

Skyscraper is a giant Drifter out in the Sunken Sea. You must kill him as part of the mission Drifter Lifter.

Spawn Location
He spawns under the separate broken highway against the far edge of the map, at nearly a straight connecting line from the World's Largest Bullet and Thirsty the Midget.

Strategy
The best way to deal with Skyscraper, especially if you are a lower level, is to stay back in a vehicle and start firing missles. If you are far enough he wont attack you and you'll have an easy kill.