And then the hive mind turned its attention upon the scene, and the eldar screamed. Sunspear staggered, his spirit crushed. For just a second, he wished to flee and hide from the scrutiny of the terrible being staring at him. He became aware of his own insignificance, he was no more than a particle of food. The hive mind’s ancient intellect was as wide as the void, its examination of him was a cold spike through his heart, and his mind was swamped by endless horror. One of the warlocks collapsed, light pouring from his eye-lenses. He babbled nonsense in a hard alien tongue, and died. Serriestalor screamed and screamed, clutching his helmet. The other psykers rallied themselves, redoubling their psychic defences. It took all their effort just to keep the pressure of the hive mind at bay, and their offence died to nothing.

Devastation of Baal: chapter 10, page 138

“You suggest we fight a god?’ scoffed a Space Marine of cadaverous appearance. His eyes were sunken in skin that looked dry as dust.