The phrase "final culmination" means the end or conclusion of something, usually after a series of steps or events. It refers to the moment when everything comes together or reaches its highest point. Full definition
His cross was the final culmination of all wrath and fury, divine and human. (religion-online.org)
The body of Christ need not be the final culmination of the creative process. (religion-online.org)
The final culmination itself, though, is filled with the sort of vital storytelling juices that seemed to get leeched out of «The Twilight Saga» halfway through. (thefilmyap.com)