Like all reptiles, the longer a dragon lives the larger they become. As their size increases, so does their power. Easily the largest dragon I have seen would be Shruikan from the Inheritance Cycle. Shruikan was so large that he was almost a living mountain. In the picture above, you can see that Shruikan (the black dragon) dwarfs all other dragons in the story. The small speck that is positioned between the red and blue dragons is an average sized person. Most fans speculate that Shruikan was 300 meters (984 feet) long with a wingspan twice that long. When you put that scale into perspective, Shruikan made Balerion the Black Dread (the largest of the Targaryen dragons) from Game of Thrones look like a small lizard by comparison. Even though we never got to see Shruikan truly unleashed on a battlefield, I believe such a dragon would wield enough firepower to rival a megaton nuclear warhead. Unleashing a dragon of Shruikan’s caliber on a battlefield would be a new definition of the word “overkill.” In my third fantasy book, I am thinking of including a dragon that is as large and powerful as Shruikan.