Illager Boss

Hi, 

My idea is to add an Illager boss in Minecraft (I know this idea already exist, but I have more details and arguments on why this should be added).

First, lets put a little bit of context. In 1.14, Mojang updated the villages and added raids. The problem is that evoker spawn in raids, so they drop totem, and since this time most of players don't see anymore interest in going in mansion (since before it was the only way to get totems). So, adding an Illager boss in mansion would be really attractive to players since this would be exclusive to mansions.

Second, adding and earth boss to the overworld would be more interesting when you don't have the waters enchantements on your armor. And what's better to an overworld boss than an Illager one ? Illagers are kind of the antagonists of the minecraft overworld lore, so adding and Illager Boss would add way more sense to the Illager saga.

So, what would exactly be this boss ? I think it would be an Illusioner with more hp and that rides a ravager. This Illusioner would be on the little third stage (taking it entirely) in the mansion and would be able to summon Illagers. He would also throw potions like witches. Once killed, he would give a good amount of exp (like 20 to 40 levels), a notch apple and an Illusioner hat, which when on head, give invisibility infinitely without any particles (and of course the hat isn't visible). Also, this invisibility wouldn't be detected by mobs EVER, even if you're in the same blocks than them.