Cordyceps

[Klayboxx]

If it were a traitor item, why not make it act sort of like mindslaving? After the first level of infection you get a big red goal-change message along the lines of "conceal your infection and try to infect as many other people as possible as you die"?

Cus that'd totally be out of the hands of the traitor, that's like getting the artistic tool box and every time you kill one guy you give it to someone else.