Catastrophe the concluding action of a tragedy, where the principal character meets death or other significant defeat
After defeating the mead halls monster and grendal, and even grendal's mother, beowulf had the hearts of all the people in Herot and becomes king of the geats. After 50 winters a dragon appears after being pestered by one of his men, beowulf decides to kill the dragon himself. When he fights the dragon he does end up killing him but not before the dragon bites beowulf's neck and leaves a venomous mark on him, this ends up being his heroic, catastrophic demise, truly a death fit for a hero.