The End has a The Ender Dragon, The Nether has The Wither, so what about the Overworld? Well I thought about what a really good boss could be, and then I had it. What if you took an already existing structure, the woodland mansion, and gave it a boss room? Well I was thinking that 1 out of every 2 woodland mansions would generate with a secret boss battle room. Perhaps there is a lever combination, much like that of the jungle temple, that will open up a staircase deep in to the ground, or to make it so the player couldn't simply run back up to heal, a straight drop that wouldn't be enough to kill you, but would take a while to find a way out. Then, when you come out of the tunnel you would be in a sort of arena. I'm thinking that it would be like a gladiator arena, with a lava mote around it prevent escaping. For the boss itself, I was thinking an evoker, perhaps with some extra magic abilities to make it harder, riding on the back of an ancient ravager, bigger than the normal one, with glowing red eyes, at least 75 extra health and it would be really scarred. To make it more dangerous it could have some unique attacks, so that after defeating the evoker, it wouldn't be too easy. Maybe it could shoot spikes off the side of its body like arrows, and could be a little faster than a normal ravager. It would drop 600 Exp, a totem of undying (well, from the evoker), and some special item... comment what special item(s) you would like to see!