How to respawn the Ender Dragon (Minecraft)

The Ender Dragon is the final boss of Minecraft, and can be a challenging fight. Once you beat it, you complete the game, so what do you do if you want to fight the Ender Dragon again? 

Luckily for us, it's pretty easy to respawn the Ender Dragon. You will need 4 x End Crystals to spawn him. These can be found on top of the obsidian pillars in The End, or crafted by combining the following:
- 7 x Glass
- 1 x Eye of Ender.
- 1 x Ghost Tear. 

When you have four End Crystals, go to The Nether and locate the Final Portal. Place the 4 End Crystals on each side of the Final Portal, and upon placing the 4th End Crystal, the Ender Dragon will repsawn. There's a little bit of a wait while he respawns, but you get to see a cool animation while waiting. 

And that's all you need to do in order to respawn the Ender Dragon. Good luck with fighting him again!