The term 'Blitzen Colleague' is composed of five crossword solutions: Donner (6 letters), REINDEER (8 letters), Und (3 letters), Santa (5 letters), AND Erle (4 letters). Donner is a REINDEER in the popular Christmas story, 'The Night Before Christmas, ' who is one of Santa's eight REINDEER. REINDEER are a species of deer native to the Arctic AND Subarctic regions of Europe, Asia, AND North America. Und is a German word meaning 'AND.' Santa is a mythical figure associated with Christmas who delivers presents to children on Christmas Eve. Erle is another REINDEER in the same story as Donner, AND is also one of Santa's eight REINDEER. Together, these five crossword solutions form the term 'Blitzen Colleague, ' which refers to one of Santa's REINDEER, Blitzen.