Eye of Ender

An Eye of Ender is a one-use item the player can create to repair an Ender Portal Frame block which are found naturally in Strongholds.

As shown by Jeb in his livestream, it can also be thrown, acting as a guide to locate the Air Portal Frame found within Strongholds. When the Eye is thrown, it will float diagonally upwards for about 15 blocks towards a stronghold. It emits purple particle effects and hangs in the air for 3 seconds, before either falling back to the ground as a collectable item, or occaisionally shattering and "returning to the Ender"; this feature was added in 1.9 Pre-release 4. When the player throws the Eye when within about 20 blocks of the x and y of a stronghold, the Eye will "sink" into the ground instead.

History
It was first added in Beta 1.9 Pre-release 3.

Trivia

 * The Eye of Ender appears to have the same coding error as Sugar from 3rd person view, appearing oddly large from 3rd person view.
 * The Eye of Ender's right-click function does not work when in The End.