Board Thread:Versus Battles/@comment-27044517-20180503190109/@comment-29825745-20180518191748

It would be a mob which constantly outputs huge knockback, damage on the scale of a Creeper, teleports, moves as fast as the fastest mob, has long ranged attacks that may quickly kill you if you don't have any armor on...

Possible? Yeah, considering it's flying and regenerating but ignoring damage, and that its attacks are all about teleporting to you and making a Charged Creeper's explosion which may kill you on any non-enchanted armor if you take it to your face. You might be able to, dunno, spam health potions and highest grade golden apple while using a full set of Protection V, Feather Fall maximized and breathing underwater etc diamond armor, and use your sword to land a hit every time it approaches.

Still, the fact it regenerates while being immune to projectiles and has such a huge HP makes it likely that being it would be down to pure luck and/or glitches.