End Crystal

The Ender Crystal is a new entity that exists in 1.9 Pre-release 6, it is made up of parts using borrowed textures: The base has the texture of bedrock, then on top of that is the texture of fire, and finally on top of that is a pink cube with unknown symbols on it encased in two cubes with a modified glass texture. It sits on top of/in a bedrock block(it appears to be merged with the bedrock block, the bottom has a glitched texture, on top of all the obsidian pillars in The End. As the enderdragon flies by them, they establish a "static beam" that heals the enderdragon.  Unfortunately the enderdragon never ventures far from these crystals, which makes it almost impossible to kill it with them active.  In order to destroy one, you need to either shoot it with an arrow (or egg,) or climb to the top of the pillar and manually destroy it.  Unfortunately the Crystal will explode on it's destruction, so hitting it with an arrow is preferable.  Once all of the Ender Crystals are destroyed, the enderdragon can be defeated, albeit with 200 hit points it will be difficult.

Trivia

 * Blowing up an Ender Crystal while the enderdragon flies close by will deal a small amount of damage to the enderdragon.