The concluding parts of an event or occurrence(noun)
WordNet. Princeton University. 2010.
Use "final stage" in a sentence
"The final stage of the race was an 89.2-mile ride from Arpajon to Paris."
"Research on the diffusion of innovations followed these rise-and-fall stages rather closely (Crane, 1972), although the final stage of demise does not seem to have begun (except perhaps in certain research traditions, like rural sociology)."
"The topmost shelf of every closet was made to yield up its secret, cellar and coal-bin were probed to their darkest depths and, as a final stage in the lustral rites, the entire house was swathed in penitential white and deluged with expiatory soapsuds."