End Cube

A possible End addition would be the End cube. I kind of think that since the the Overworld and the Nether both have their own type of slime, the End should have one too. The End cube would be characterized with the appearance of a portal block of the End portal (you know, the way they looks like a texture on the other side of them), with a glowing purple eye (like a snake eye or maybe an endermite eye) on one side. Each of the three sizes would have slightly different behaviors. Large are only hostile when attacked. They teleport only when aimed at by a bow and will take this as an attack. Medium are hostile when attacked or if you look directly at them, basically like an enderman. They teleport when aimed at by a bow and if far away when looked at. Small are always hostile and teleport as an enderman does.

            The cube would drop End gel, which has one primary use: making End gel blocks. The gel block could then be combined with obsidian and cryte to make a teleporting block. This will transport you to another block with an identical code, which can be added by placing on the block and typing it in. These blocks could allow for quick easy transport in survival mode.