End Storm/Event

After defeating the Ender Dragon, there's a chance of an end storm occurring only on the main end island. You could hinder those chances by placing an end crystal where the dragon egg spawned, or by leaving the egg there. 

The storm would create a thick gloomy lilac-colored fog and violet orbs would begin emerging from the fog that would strengthen all enderman on that main island, aswell as making them faster. Because of this storm, their eyes would glow, and they would become aggroed to anything that is not them. But the storm decreases their sight to maybe... 10 blocks (they would see you before you see them though). This storm would then cause the gateway home to temporarily close.

At a certain time during the storm, violet lightning bolts would begin hitting the tip of each tower one by one, until it hits the tip of the exit portal, allowing access to somewhere new. This forms a new question, is the enderdragon truly an enslaver or a guardian from something more dangerous?