A cavern conyaining lots of coal, iron, lapis lazuli, redstone, and mos importantly, DIAMONDS! at the end is a sealed chamber containing a completed Ender Portal... and an Ender Chest. play on whatever difficulty, but you should get a bow before you go into the End. Also, I've killed all the Ender Crystals. ;D You spawn near a large ocean. A weird, giant mountain is not far away. The shore closest to you is near the entrance. Seek fire under the water to light the way!