Most of you think: Dragon of course! But there are some facts that prove that Ghast are strong enough to beat the dragon: just imagine you floating up, devastating the pillars with ease and facing the "Lord Ender Butt", like the legendary AntVenom said and... STOP! The dragon is immune to fire! Different solution: the Ghast fireball is explosive. How do we know he is not immune to explosions like he is to fire? Simple. Ghasts are fire-resistant too, but are killed in one hit if their fireball is deflected point-blank at it. The Ghast, however, is low on health and will be destroyed in one hit. What do YOU think about that?