New Mini Boss In The Nether And End

This is not exactly what should be added into the game

Nether Warden

The Nether Warden, Who knows where it would spawn. For this, lets say the nether fortress. The warden would be would be walking around, guarding the fortress, you have to be extremely careful trying not to run into it. (Or it could be spawned in other different ways, like killing a certain amount of blazes would trigger it) Lets say you get past it, and you get to a blaze spawner, ready to kill blazes for rods, but once the blazes spawn, they immediately alert the warden of an enemy. They warden would then make its way towards your direction, you have to act quick. Escaping the fortress would be extremely difficult, mobs like wither skeletons and piglins will spawn near any type of exit and block your path, trying to escape from destroying the blocks above you or below you would be nearly impossible, you have to fight the warden. 

If I were to list everything, it would take far too much space, and this won't let me type more than 1500 characters, so I am unable to type much more, I'll be posting another part to this I'll list the nether wardens attacks, and I'll be talking about the end warden. Also, a warden variant doesn't need to be a new mini boss, but Im using the warden as an example of what could be good to add to the game. I had other things I wrote down, but had to delete them, this was too long. Hopefully most of you read the next one, it'll make much more sense. I had to delete a lot to fit all this.