The Creator of the mod is The Ender Mage, probably assumed you too much relax, traveling to the End in Minecraft PE, so you could use a good shake-up!
Since the release of the update containing the measurement End, it's been quite a lot of time, so players have time to adapt to its inhabitants, but The Ender Mage is too hard to mod that significantly complicates the gameplay.
How does it work?
In the game there is a new mob, and you don't have even the slightest desire to meet him – believe us.
First, it can teleport at any time when he wants it. Secondly, to have at least a Ghost of a chance to win, you will need to have diamond armor, great weapons and lots of potions.
Thirdly, all of the above will not save you from the series fireball, which you will receive in your face, if you long to stay in a static position.
In General, the more complex enemy in MCPE, you should not even dream about.