abaddon worshipped horus like a father, hence outraged.
fabius bile probably offered abaddon his services as he could work wonders, and maybe even used horus body to enhance abaddon?
abaddon was around in the great crusade 31M, so he must be at least 10K years now, and im guessing most the main astartes around the time of the great crusade were roughly 100 or so?
i doubt he was more powerful than horus at the time of the GC, he was only first captain of horus legion. although i dare say that now, in the 41st M, hes probably more powerful than horus was.
hmm i doubt tzeentch had anything to do with it, just a mess up on horus' behalf ^^
abaddon served horus first, emperor second. so he had already turned traitor without a second thought when horus said to.
im guessing primarchs are like astartes in that they dont have...anything down there...
to father a child ye know?
no idea about the emperor.
my two cents
