He shakes his head. "BOSS MONSTERS ARE VERY RARE. I BELIEVE MOST OF THEM WERE, ERM... WELL. LET'S JUST SAY WAR IS BAD AND LEAVE IT AT THAT."

But hmm... there is another possibility, but not one he's put too much focus on. Better to think of Santa as Santa! It's more magical that way. "AS I SAID, BOSS MONSTERS ARE THE MOST POWERFUL OF ALL MONSTERS! AND VERY DISTINCT IN THAT THEY ONLY AGE IF THEY HAVE LIVING PARENTS OR LIVING CHILDREN. OTHERWISE, THEY ARE FUNCTIONALLY IMMORTAL."