Shadow in the Warp disrupts technology

• Leviathan:

"He walked down the nave until he reached an oculus at the far end. The screen was vast, but the view remained as unhelpful as it had been since they left Regium. He looked out on a maelstrom of dust clouds and energy pulses. The presence of tyranids had not just blinded his augurs, it had made visual identification impossible too

‘No, my lord, begging your pardon, they are not headed towards our ships. They could have. They could have masked their approach with the empyric disturbance they’ve created, but they chose not to. They bypassed us. They’re heading in-system. They’re heading for Regium."

• Devastation of Baal:

"By Dante’s left shoulder stood the Master of Interpretations, the blood thrall liaison with the astropaths of the Chapter. Vox signals would take hours to reach the fleet. By the power of ancient science, hololithic communication was instantaneous across in-system distances, but fragile in the face of the shadow in the warp. The astropaths would be the last line of communication with the fleets. But all means, electronic or immaterial, were vulnerable to the tyranids."

• Shield of Baal [Wraithflight]:

"Lord Admiral Kelemar, I am moving to engage.' Her message was hard to send and harder to hear, a weak shout against the psychic roar of the hive mind. Only the large number of ghosts within her ship enabled it to be heard at all. Their energy impelled her thoughts, boosting the machines that conveyed her sendings. She considered switching to simpler technology, but the hive mind assaulted them on every level, and the electromagnetic interference was as bad as the psychic."