Rampaging Reaper

The Rampaging Reaper is a hostile mob that attacks all other mobs. It is a large, skeletal monster shrouded in darkness. It is 4 blocks tall, 2 blocks wide, and 2 blocks long. It's claws deal 4 (2 hearts) damage and it has 16 (8 hearts) health. It can only be affected by splash potions of healing and regeneration. It can spawn in day or night in the Overworld. I think this is a good idea because there are no hostile mobs that attack other hostile mobs yet, and that makes monsters monstrous and savage. Thanks for your consideration and time!