Which term describes remains of something that has been destroyed?

The term that best describes the remains of something that has been destroyed is "debris." Debris refers to scattered fragments or wreckage that results from the destruction of an object or structure. This could involve any broken pieces, leftovers, or rubble that are left behind after a significant event such as a disaster, accident, or demolition.

In contrast, the other terms listed do not convey the same meaning. "Cunning" refers to being skilled in achieving goals through deceit or trickery, which is unrelated to destruction. "Garner" means to gather or collect something, typically resources or information, and does not imply remains of something destroyed. "Gust" pertains to a strong brief burst of wind, which also bears no connection to the concept of remains or destruction. Thus, "debris" is the term that accurately describes the residual elements following destruction.