Board Thread:Warhammer 40k General Discussion/@comment-14745711-20130821214539/@comment-14745711-20130904212535

You'd be lucky to get the necrons working with the Eldar, the Eldar hate the necrons pasionatly and the necrons hate the Eldar almost as much because they imbody the last of the old ones great works and they want to snuff it out like a candel. But the necrons could ally with the Imperium to kill all the tyranids but I'm not so sure about chaos though. The necrons have no souls so the forces of chaos and warp hold no fear for them and so don't matter. Instead they'd probably let chaos and the Imperium fight to the death then just take over whoever is left.

The Tau probably won't make a huge difference when the end times come but I think they will end up in civil war between the Farsight Enclaves and the main Empire of the Tau. After that the remaining side will probably try and make a territory grabe while the other races fight amoungst themselves. But I suspect once the necrons have taken over then the Tau won't hold their new empire for long.