you clearly have read "galaxy in flames" horus heresy book but i would still like to ask few questions. In that book Horus, Erebus and demon talked about the war they would wage. In it Horus said that he would not use demons help yet sou there was no demons on istvaan 3. Sou why and how was this world eater taken in the warp and survived for ten thousand years? And how does he knew about god emperor? because during that time it was not a thing and practising such things would end up him dead. And what comes to not killing xenos, well he would still believe in imperial truth switch is that galaxy in mankind's birth right sou there is no place for xenos. And he would not have any problems killing innocents or civilians, infact they were famous for their butchery. In istvaan 3 they went full on killing thousands of civilians ho attacked them with knifes and hands.

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actually During the Great Crusade when it came to the Xenos it was more of a "Submit or Die", because the Emperor didnt mind working with Xenos as long as he achieved his goal. As for the God-Emperor thing Chaos Daemons would have told him or Khorne Would have.

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Actually, the God Emperor thing was an accident on my part.
As for the xenos, Khorne personally told him "I want these things dead" so that would cause him to believe that they can be useful in his vendetta against the blood god. (The enemy of my enemy dies second)

I have just found this after reading the codex of harmony and I have got to say so far so good, looking forward to seeing where this goes.

"Do I have your attention now?" asked the dark blue xeno.

Is this gonna be like that moment where a blood angel was interrogated by T'au?