Tyevic

Would love to see a rare occurring spawn of a boss for each environment. They would have a chance to appear and move through an area from day 2 forward. For example have one that a storm moves with it and you can hear chains rattle. Or for the desert have a large vulture with two heads occasionally fly by. These should be very tough zombies that would be a very hard challenge to kill. Some could have minions and each one should have some unique ability. Maybe killing them drops something that is worth the large amount of resources used to kill it. This would provide some end game play I think.