Just press escape and there over
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Press ESC
Well you will see the ender dragon egg. You can collect it. Then you need to go under the egg there will be an end portal. Go through it and it will take you to the credits. The credits are pointless. I'm not sure if you can skip them. After the credits the game will take you back to the over world.
You press the Escape key.
It gives his full name.
OMG the aether is a mod its not in vanilla minecraft and the people who made the aether mod sopped updating it a long time ago.