For the experimental combat changes coming, I think that there should be a hostile mob that attacks based on those changes, the Combater. This mob would spawn everywhere in the game, even in other dimensions. It would have 75 health points (37.5 hearts) and have an attack strength of every mob in Minecraft and randomly switch between attack strengths. It can spawn with 1 of 4 weapons which it will randomly switch in between. It will have a sword of random material, a bow or crossbow, an axe, and a trident, all with different probabilities of being enchanted with random enchantments and different levels. This mob also has different weapon reaches, with the axe being the shortest and the trident the longest. This mob is also hostile to every mob in the game, from a baby turtle to the ender dragon. This mob would provide a special combat challenge for every player that has enough combat experience, and a shield. The ideas for this are limitless!