As of Minecraft 1.9 players can now respawn the Enderdragon, even after the original one has been killed.
However, I do not recommend you respawn the dragon if the following applies to you:
- You do NOT have fly.
- You are lagging.
- Do NOT have a weapon that has at least more than 10+ attack damage.
Some people ask, why want to respawn the dragon?
Well, the only thing I can really answer to this is, that you get more xp than killing normal mobs - but it takes longer and way much more skill.
But, anyhoo, for those more "advanced" players who would like to summon the dragon on their own, here is what you will need and do (it costs quite a bit).
To spawn the dragon you will need 4 end crystals.
What resources do you need:
- Ghast tears (4)
- Ender pearls (4)
- Blaze powder (4)
- Glass Blocks (28)
What to do now with these ingredients?
Firstly, you will take one ender pearl and a blaze powder to create an "Eye Of Ender" repeat this step 4 times so you end up having 4 "Eye of Ender's". When you have the 'Eye of ender", place one of them in the middle block of your working bench, with one ghast tear directly underneath it. In the rest of the blocks open in your workbench (7) put the glass bloacks. [repeat this 4 times, so you end up with 4 end crystals.]
[will attached screenshot of recipes in comments]
After you acquired the end crystals:
- Warp to the end via command /warp hopgame
- You will see the end portal in front of you on the spawn.
- Place the end crystals on each side of the portal (in a square on opposites of each other)
BE CAREFUL NOT TO HIT ONE OF THESE END CRYSTALS AFTER YOU HAVE PLACED THEM - THEY WILL DO A LOT OF DAMAGE TO YOU WHEN THEY EXPLODE.
IF you do happen to spawn the enderdragon, and cannot kill it, ask an admin for assistance. Only one dragon can be spawned at a time - and you DO NOT GET MONEY FROM KILLING IT - ONLY XP - if the dragon happens to kill you, just go /back and get your items. It is recommended that you go with diamond armor, since when the dragon is spawned, it does go to regenerate health on the portal - when it is regenerating it cannot be killed or damaged.
I hope this "Guide" helped some of you who has been wondering about it