
The builder moves the crystal to the upstairs, and finds the room is filled with boxes as well as having a gaping hole in the ceiling. The drone's upgrade is finally finished, the builder surprised at how awesome he did, while the cave-exploring builder is finished with his work as well, but falls into the water as he trys to get back down.
(Note: The Wars are basically like RTS games; the units don't attack attack attack, there is a strategy involved.)