Bigby's Construction Crew is a ritual introduced in Unearthed Arcana, concerning Strongholds. [Dr395] As an unearthed arcana ritual, it is not considered to be part of normal gameplay. A veritable army of magical hands appears in the air around you, each armed with tools appropriate to the task to which you set them, from carpentry to masonry. When you perform the ritual, you describe the desired construction in great detail. The hands start working as soon as they appear, and assemble the structure from available material. They can quarry stone and cut it into shape, fell trees and saw them into lumber, and so on. Their range is limited to 1 mile.