The Thrasher
His job is to force the survivors to adapt to changes during a panic event. They can no longer camp one spot for the entire period.
A zombie whose particular virus strand deteriorates his body. He only appears during panic events excluding boomer vile. His deterioration weakens his muscles so he can only move a little slower than the smoker. He attacks by thrashing his arms, which causes them to fly off. Shortly after landing they entirely decompose spreading out and leaving behind a damaging pile of goo. He can only attack twice with a short cooldown before his must use his third attack in which he thrashes off his head and dies but causes an even larger goo pile. On dying, his body will also decompose and leaving the largest goo pile. If a flying limb hits a survivor, it does a small amount of direct damage, but more importantly, it instantly decomposes.
Backstory:
His virus strand effects two different areas of the body differently. It causes muscles to create a protein that rapidly decomposes all organic matter. However, if it latches on to a nerve cell it creates a sort of serum to the decomposing. As most viruses it is parastic, leeching off of the energy of the host. Because of the massive energy required to constantly secret serum the thrasher is comatose most of the time. But, when there is a loud noise like a mechanical door opening, an elevator coming down, church bell ringing, car alarm going off, etc... he awakes. His body is pocketed with holes where his body could not create enough serum. On dying rapid changes to what nerve cells do causes his body to thrash wildly for a second before decomposing.