Monocoque can act as a noun and an adjective. A noun is a type of word the meaning of which determines reality. Nouns provide the names for all things: people, objects, sensations, feelings, etc. The adjective is the word that accompanies the noun to determine or qualify it.
Only the most powerful speedsters can: 1  Run fast enough to approach the speed of light. 2  This feat needs complete control over a Flash's speed aura, molecular control and endurance enough to enter the Speed Force dimension.
The Black Flash fulfills the role of Death for those who possess super-speed, returning them to the source of their powers: the Speed Force. It was reportedly seen before the deaths of Barry Allen and Johnny Quick; Max Mercury, having had several near-death experiences, also saw the Black Flash.