Nether Boss Fortress

Okay so the idea I had was that maybe we could have a boss in the nether that you could summon with Either the dragon egg or dragon head and a nether star because you need to go to the nether to be able to fight both of these bosses, my idea is that there would be a room in the nether fortress where you can place these items and then a final boss would spawn in stronger than the other two bosses. I think this would be a cool idea because it would bring more use to the nether and the way the nether is set up it could add a challenge of also avoiding the other mobs and lava. Maybe the boss could be like a Nether skeleton blaze mixture, or a entirely new boss (maybe the fortress itself could turn into a giant enemy).