User blog comment:Tardir/Mutacrat - Hedoth War/@comment-1932673-20110207160312/@comment-1536954-20110210065449

Necrons are so technologically advanced that races tend to stay out of their way (usually when a necron army of equal or bigger size confronts them). They usually only attack the necrons when their own armies horribly outnumber them. Its simply just that any other conflict ends in failure. Thats probably a reason why armies like Dark Eldar would not go up against necrons unless of course the objective is crucially important.