"Tull gazed at Loken for a long, silent moment, as if judging his options. Finally, he shrugged and said, 'Kaos is a primal force of the cosmos. It resides within the Immaterium… what you call the warp. It is a source of the most malevolent and complete corruption and evil. It is the greatest enemy of mankind – both interex and Imperial, I mean – because it destroys from within, like a canker. It is insidious. It is not like a hostile alien form to be defeated or expunged. It spreads like a disease. It is at the root of all sorcery and magic. It is…'
He hesitated and looked at Loken with a pained expression. 'It is the reason we have kept you at arm's length. You have to understand that when we first made contact, we were exhilarated, overjoyed. At last. At last! Contact with our lost kin, contact with Terra, after so many generations. It was a dream we had all cherished, but we knew we had to be careful. In the ages since we last had contact with Terra, things might have changed. An age of strife and damnation had passed. There was no guarantee that the men, who looked like men, and claimed to come from Terra in the name of a new Terran Emperor, might not be agents of Kaos in seemly guise. There was no guarantee that while the men of the interex remained pure, the men of Terra might have become polluted and transformed by the ways of Kaos.'
'We are not—'Let me finish, Loken. Kaos, when it manifests, is brutal, rapacious, warlike. It is a force of unquenchable destruction. So the Eldar have taught us, and the Kinebrach, and so the pure men of the interex have stood to check Kaos wherever it rears its warlike visage. Tell me, captain, how warlike do you appear? Vast and bulky, bred for battle, driven to destroy, led by a man you happily title Warmaster? War master? What manner of rank is that? Not Emperor, not commander, not general, but Warmaster. The bluntness of the term reeks of Kaos. We want to embrace you, yearn to embrace you, to join with you, to stand shoulder to shoulder with you, but we fear you, Loken. You resemble the enemy we have been raised from birth to anticipate. The all-conquering, unrelenting daemon of Kaos-war. The bloody-handed god of annihilation."