End portal

Air Portal is a block that was added in Beta 1.9 pre-release 3. It has no official name, and is often referred to as "black stuff". It has a very strange appearance, which can be best described as a portal view on a virtual black floor with blue star-like particles on it. It also emits light and black smoke. Only the top and the bottom sides of the block are visible, the bottom side looks like stone. In addition, the bottom cannot be passed through from either side, although the sides and top can be. The collision box for this block takes up the lower 1/16th of the block, similar to Snow.

It's purpose is currently unknown, but evidence suggests it will be used as a portal to the Sky Dimension.

Bugs

 * The game will crash when you move the cursor above the block in the inventory because it is not supposed to be obtained and has no tooltip. A client mod has been released to temporarily fix this.