The Endermen's one and only goal is to decimate and erase all life in the universe, and its dimensions, they do this by stealing blocks essential for life to exist, and then destroy them. of course, this is painstakingly slow, but they have eternity on their side. However, there is something far worse to be unleashed once the Endermen are done with their goal, something capable of outliving even The End as a concept. A Golem of Constant. formed by a fraction of every life in Minecraft, Humans, Monsters, Blocks, Time.

It is the only thing the Endermen wont be able to destroy.