End Crystal

The Ender Crystal is an entity found in The End. They are found atop the many Obsidian Pillars found across The End, and their primary purpose is to recharge the health of Enderdragon, who will charge from the nearest Crystal within a small radius.

When hit by the player they will explode, leaving only bedrock and the tower. The base appears to be made of Bedrock, with a crystal hovering over it and fire engulfing it. The player must destroy a majority of these in the immediate area in order to defeat the Enderdragon effectively. If the Enderdragon is caught in the explosion from the crystal, it will take a small amount of damage.

Strategy
The recommended method of destroying one of these entities is to shoot one with an arrow, although snowballs, eggs, and fishing rods also work. The player may climb on top and attempt to destroy one by hand, but the resulting explosion might hurt the player, and throw them off the tower. Note that during this, the player will be in danger of Endermen attack, and even worse than that, the Enderdragon coming.

Another way to reach the top of the towers is to throw an Ender Pearl up to the top, as these are plentiful in The End. If the player wishes to destroy one by hand, it is advised to mine the Obsidian around the tower, instead of creating ladder or stairs out of material that might be broken by the Enderdragon's attack.

Bugs

 * If an Enderdragon passes through one, the explosion sprite will appear since it is clearing the fire, but the entity itself will not be destroyed.
 * When created naturally, they are layered directly over a Bedrock Block, which is most noticeable when viewing one from below. The player will see glitching of the textures where the two overlap.

Trivia

 * Placing water above one using a Bucket will cause a looping effect, whereas the fire is continuously put out and reinitialized as the water attempts to flow down and is stopped. The water will not spread, as it can flow downward, but is being prevented by the reoccurring fire instantly taking its place.
 * The healing beam is not obstructed by entities or blocks, nor is it diminished by them.
 * In Minecraft versions including Spawn Eggs, the player can spawn Ender Crystals by using the /give command in SMP as so: /give PLAYERNAME 383 1 200
 * The fire that Ender Crystals emit can set entities and flammable blocks on fire.

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