The phrase "climactic confrontation" refers to a significant and intense conflict or battle occurring at the peak or decisive point of a story or situation. Full definition
After building up to the great climactic confrontation for two - thirds of the movie, it's a letdown. (sfchronicle.com)
For the most part, this film closely mirrors the structure of the 1987 original, effectively conveying the jungle atmosphere, taking its time before unleashing a Predator (multiple ones in this case) on the protagonists, then having them be hunted down and killed one after the other, until only one remains for the big climactic confrontation. (montrealfilmjournal.com)
And while there may be no Balrog this time out, there is an awfully similar climactic confrontation on a narrow subterranean bridge. (theatlantic.com)