This is part of my “Pyre” world.
These four-story-tall floating vehicles were used mostly for construction. They look like a huge legless metal body, their torsos comprised of several enclosed compartments for hauling materials, plus two arms ending with pincers, and a control cockpit in the head.
Builders can be controlled by anyone who’s had the appropriate ritual applied to them.
Desperate defenders of Pyre attempted to use Builders to crush its attackers during Twilight, and many Builder wrecks lay scattered around the city. Some of them may still work.