How do you respawn the Ender Dragon? [duplicate]

I heard that you can respawn the ender dragon but I don't know how. Can someone please tell me? I tried putting end crystals on the pillars but it did not work.


Solution 1:

  1. Find the Final Portal.
  2. Defeat the dragon
  3. Put 4 end crystals on the portal

How to respawn the ender dragon