Enderman Haven

After the nether update, the next logical location to update is the end. This would be a good time to fix one major issue with the end: despite the fact that endermen are everywhere across the end, there are no structures associated with them. So I suggest the End Haven (or Endermen Haven).

Generating underground in the end and bearing similarities to strongholds, although made with local blocks instead, the end haven would house large amounts of endermen, as well as a new endermen: the enderman defender (name not final). They would be more powerful versions of endermen, being able to pick up more blocks and use them defensively, with an eye of ender in place of the normal endermen face. They would be hostile on sight, but when killed, would allow the player to access the loot. In the treasure room, there would be chests with ender pearls, diamonds, and other rare items, such as perhaps a new item unique to this structure (although I'm not sure what this would be), as well as a chance for a portal to generate to report you to a nearby haven without the defenders and a small amount of extra loot, as well as a portal back to the original haven.

I'm short, the end haven would be a underground structure with rare loot and a new miniboss, as well as a portal to a nearby haven.