Description: Ye gods, this thing is easily twice the height and four times the bulk of a normal human being. Muscles ripple under the decaying flesh like bridge cables. The cranium has not swelled to match the proportions of the host however, leaving the thing with a tiny head perched upon a massive body. The effect would be quite comical if the thing wasn't so god-dammed big and so obviously dangerous. It's completely naked - presumably whatever clothes the thing has been wearing had burst away as it grew.
Consider: The massive behemoth is elite. The massive behemoth is rated as an extremely skilled zombie.
Death by behemoth:
(1240 MHz) cheeky cuts in and out, intermittent with deep, angry sounds of something very large in the background. There is one sudden crackle of static, and the radio goes dead.