Although it takes years of discipline and training to master any particular element, Aang must master them all and defeat the current [[List of Avatar: The Last Airbender major secondary characters#Fire Lord Ozai|Fire Lord, Ozai]], before [[summer]]'s end, when the return of Sozin's Comet will grant the Firebenders the power needed to win the war. If these events come to pass, not even the Avatar will be able to restore balance to the world. The urgency to gain his full mastery of all the elements and confront the Fire Lord has been even more hightened due to a recent revelation. Aang and his friends have discovered that, shortly before Sozin's Comet reaches their world, there will be a complete solar eclipse. This eclipse has the exact opposite effect of the comet. While the comet greatly increases a firebender's power, the eclipse will take a firebender's power away, and provide Aang an advantage in confronting Ozai.
