debuff vs weaken

debuff

verb
  • To make a character or unit weaker. 

noun
  • An effect that makes a game character weaker; a negative status effect. 

weaken

verb
  • To make weaker or less strong. 

  • To become weaker or less strong. 

How often have the words debuff and weaken occurred in a corpus of books? (source: Google Ngram Viewer )