Epitasis is a word borrowed from ancient Greek, meaning the central or main part of a drama or narrative. While it's a unique and specific term, there are several synonyms that capture its essence. One alternative is "climax," which suggests the highest point of tension or excitement in a story. Another possible synonym is "turning point," which highlights the moment when the narrative changes course or takes a different direction. "Crisis" can also be used to describe a pivotal moment in a plot or character's arc. Lastly, "focal point" carries the same connotation of being the most important or prominent aspect of a drama.