This will probably be your only real chance to kill the dragon. Bite - If you're using this attack you probably shouldn't be. To your amazement biting enemies is not as useful as roasting. It's more or less a novelty attack. Flame - This is your starting breath weapon but is useful through the entire game.
Primary fire is a beautiful fireball capable of hitting targets from a long range.
While secondary fire is a flamethrower type effect that is extremely useful for taking out land dwelling enemies. Simply get close to the enemy and let it rip. Poison Gas - This weapon is useful for hitting enemies deep inside caves or hiding behind unreachable objects. Its secondary fire shoots a gas ball that if angled properly will bounce a few times before settling down. If fired into a small cave it will have a very good chance of hitting an enemy.