Well a unit of 20 Necron warriors (260pts) 404ing for a whole battle due to wizardry is going to anger even the most decayed of logic circuits. Your Psyker scum should be wary for Canoptek Wraiths and large gauss templates.
After all the bombs have fallen, after the 60 minute war, when nuclear winter blots the sky, there will be one cockroach left: Headbanging!
Official greeter, genetic surgeon, quartermaster and general conscript doomer.
Although research is ongoing, currently there is no direct evidence that links shiny things to brain cancer.