Board Thread:Warhammer 40k General Discussion/@comment-90.211.181.229-20130907201722/@comment-3258762-20131203182949

Pfft, no one is capable of wiping out the Orks except the Tyranids, and even that is a massive stretch of canon possibilities. The Orks could easily cover the entire galaxy if the Imperium didn't stop them, since the Imperium is the only thing that fights Orks on their terms: Strength in numbers.