Adds some naturally spawning mini bosses, bosses, and mobs.
My favorite boss is the totem king, he fly's and drops minion totems on you to attack you, he swoops down to attack every once and a while.
There is also kyber ore that you can make a lightsaber out of with gold, iron, and kyber.
You can also breed diamond chickens with diamond wheat, that seems pretty obvious how to craft.