Eye of Ender

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

As shown by Jeb in his livestream, it can also be thrown, somehow acting as a guide to locating Strongholds, however this is not yet confirmed. There is a chance that it will return into the Ender dimension via implosion after being thrown.

Crafting
An Eye of Ender is produced when a Blaze Powder and an Ender Pearl are crafted together.

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