There should be another boss mob added to the game. I don't have a name yet, but the mob spawns in an evil place called the Dead Land, kind of a mix between the End and Nether. The terrain is made out of Obsidian and Soul Sand. There are also lava waterfalls coming down cliffs. Zombies, Skeletons, Pigmen, Magma Cubes, and Slimes can spawn in the world. A feature in the world are sandstone temples (pyramids, shrines, whatever you like to call it) with chests inside. Back to the boss mob. You can find him in the Obsidian Temple somewhere in the map. The mob has a half-skleton half-zombie face with an enchanted leather cap and tunic, and iron pants and boots. The boss mob carries a gold sword enchanted with Knockback II.
Ehh... If there was to be a new dimension, I personally would want it to have new and unique mobs. I think this idea would be better as a mod, but it needs more detail.
A New World/Boss Mob