Xerxzes, to Lexander: "The young ones, always so certain. Yet what do you know of purity and honour? What do you know of Istvaan? What do you know of the Great Betrayal? The answer is nothing. Nothing except lies...ten thousand years of lies, one heaped on top of another."
He steps forward, into the ruddy light of the enginarium. A towering giant in arcane power armour that seem to resemble the colours of the Cadian dawn. His helmet is donned now, but his bolter is still slung. Instead he is armed with twain melee weapons; a vicious-looking chainsword and a jagged obsidian blade that remains matte-black despite the pulsating lights of the warp-core.
He keeps talking. "Do not let the past or narrow-minded dogma limit your vision Relictor. Yours is a chapter that dared look beyond the veil of lies. That cost you dearly, but to those of your that still live: Do not throw away what you have gained. Lift your gaze from you single-minded quest for chaos-infused artefacts and look the the greater whole. Look up an realize you are free of the yoke - free to realize your dreams, free to seek vengeance against the Grey Knights...if that is what you truly desire."
Addressing all of you in general: "The Great Betrayer, the Corpse-God of Terra, is dead at long last. The extinction of the baleful glare of the Astronomican is proof enough. This is the dawn of a brave new ago and you could be its heroes! Yes, you! You, not me! I'm from a different day and age, my time long past, this is your age."
He fixes Nouri with his visored gaze: "First we must decide: Will there will be battle between us - or not. With these hands I have killed more than a million men, a few dozen more shall no bother me. So which is it? Death or glory?"
Those of you with strong minds or significant psychic shielding are not so affected (i.e. Nouri, Luliana, Gaius, Lexander and the Locum), but for the rank and file Xerxzes worlds seem uncommonly wise and fair. So much so that they cannot see any reason at all to attack the noble space marine.
The warp core: "You idiots! Why did you listen to him! Kill him, kill him now!!!"