So, I got the notion to fight the EnderDragon with my patented Destruction Sword. What is the Destruction Sword? Well, it utilizes commands from the Essentials and World Edit libraries. Left Click fires out ghast fireballs, while Right Click places a sphere of TNT wherever I wish. (in this case, the spheres had a diameter of 6 TNT each) While "Destruction Sword" might not be the most original name, it certainly is accurate. :V I'm sure I'll come up with a better name later.
Against the Dragon, it did so-so damage. Fireballs didn't do much, and hitting him with TNT blasts was tricky. Later I learned that the Dragon can detonate TNT by flying through it, so it really came down to placing TNT in its flight path.
[attach=1] [attach=2] [attach=3]
Needless to say, I nuked the fuck out of the End. Poor Shady got caught in the blast a few times.. Oh well. Collateral damage..

I wanted to leave the End like this so I could laugh and scoff at any future attempts at slaying the Dragon... but I opted to reset the End anyway. It was due for one, even before this nonsense.
And no, I didn't keep those levels afterward.