Dragon

You will find the boss sleeping somewhere on the level, once you get close to it, it will wake up and attack. He will fly towards the hero.

Heath: ~75 hps

Strategy
The best strategy is to watch the dragon and learn its attacks. Get out the way when it ground pounds and does fire breath, it is open to attack other than that. The swoop attack is the most difficult to avoid, there is a short animation when he is about to use it, but its pretty fast.