User blog comment:CaptainAndrath/Sigismund or Abaddon/@comment-3258762-20130317192516

I take it we are speaking Heresy Era and not Abaddon Champion of Chaos who has ten thousand years of experience vs Dead Sigismund.

If the earlier, Sigismund, he was possibly one of the greatest Astartes warriors to ever live. If the latter, Abaddon.