Warp Amp

Source: Codex: Chaos Space Marines (1999), p. 21

You can only take this if your army has at least one squad of Noise Marines and it may only be fitted to Land Raiders, Predators, Rhinos and Dreadnoughts. The vehicle is equipped with a devastating device, designed to amplify emotions and sensations by projecting resonant warp energies from rune-encrusted horns and pipes that sprout from the vehicle. The closer a creature comes to the amp, the harder it is for it to maintain discipline and conscious thought. Enemy models within 18" of the warp amp suffer -1 to their Leadership when taking Morale tests. If they are within 12" this is increased to -2 and within 6" it is increased to -3.