The Stalker

Similar to the warden, this will be a rare hostile mob, with a one in 1.000.000 chance of spawning. Instead of killing the player, it will stalk the player until their spawnpoint. When it reaches the destiny it starts killing the player. The only other form of causing it to attack is attacking first. It will appear in the Nests a structure that only spawns in less than 0 in the z axis in mesas, savannas and deserts. It will also be with the Spawn, its children that eventually will turn into Stalkers. The nest will have a one in 1.000.000 chance of spawning