living end vs pièce de résistance

living end

noun
  • The most extreme form of something or the final and most impactful development in a series of events — whether favorable or unfavorable 

pièce de résistance

noun
  • A masterpiece; the most memorable accomplishment of one’s career or lifetime. 

  • The chief dish at a dinner. 

How often have the words living end and pièce de résistance occurred in a corpus of books? (source: Google Ngram Viewer )