Colossus Boss

A Colossus mob could be a very tall, Stone Boss that spawns once in certain biomes called Dark Valleys, which are covered in purple grass and withered trees. The Stone Colossus would have 100 hearts of health and is aggressive to animals and players that attack it. It can make huge shock waves when it does a stomping attack and can smash the ground. Once you defeat it, the Colossus drops a special type of stone that you can use to create a small version of the mob (the same size as an iron golem) that will protect you from hostile mobs.