An End pocket dimension

We all want new dimensions, both players and developers, so imagine this: in the End world you can find this incredibly rare structure/altar, with inside it a never seen weird looking enderman with armor structure/totem/statue, which will teleport you in an isolated, flourished island with how was the End once upon a time before the arrival of the ender dragon. It would a nice introduction for a mini boss (their spawn rate would be quite small for the fact there are very few of them remaining), a set of armour and new blocks. You may travel in this pocket dimension but it will be nothing aside from that small island(different biomes for every island); the endermans will protect that altar and island by becoming aggressive if you will come near or inside it P. S. Sorry but English is not my first language