Hello ya'll, ( Yes I have done the suggest Mob Form )I just came up with a cool idea, a Wither Mini-Boss named Quietus, ( meaning: death or something that causes death, regarded as a release from life ) He would be a slightly larger than normal Wither and with an added smoke effect to him. The message would be something along the lines of, "You feel a dreadful being is near..." The sound is a slightly slowed down Wither spawning noise. Quietus would spawn Enraged Guardian Wither Skeletons, which would act like Enraged Guardian Zombies. His main drop would be the " Undead Wither Skull" which would shoot Wither Heads (like the Wither) with a small cool-down between shots. But the most unique part is that he would spawn only in the Nether. Here's some pictures in the Spoiler I made up as a kind of "concept art"