Giant biome entities

Well I have been thinking about. Blocks like the nether reactor bone block. The Nether Reactor is the core of the Beast. As it resurrects the bone block structure into an entity with the rest of the biome form ring around its structure. The huge entity will be biome themed. Normal weapons won't be effective. Making the players having to fight with shovels and pickaxes. Digging into the Titan to turn it off for repairing it to tame it and to ride it. Leaving huge Trails of compressed grass. And can be activated randomly bye naturally-formed bone block structures with gold and diamond cores. Depending on how the skeleton is formed. The Titans can come in different variations. Bird fish Beast. Players can also create their own skeleton form to create a mobile house or train. Being in a semi structure mob. But the structure cannot be edited once the Titan is forumed.