Strategy is simple, first you have to shoot Ender Crystals which are situated on top of obsidian pillars (I did it with my weaker bow). Then I drank second Potion of Strenght, switched to my better bow and started killing the End Dragon.
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It was pretty fast and simple, I think it took me around 4 minutes to take out the dragon. I expected it to be something like 15 minutes hardcore battle :D
End Portal, Dragon Egg
Thanks for your attention, stay tuned for some tips from The End!