The story says that long, long ago, the Necrontyr race and the Eldar were fierce enemies, but a lot has changed since then.
So now, with the current fluff, don't you think that they could be a win - win for both of them be allies? Please, correct me if i'm wrong, but i think that this are the current motivations for them:
- find an organic species whose bodies would prove to be suitable vessels for Necron minds
- awake their empire to conquer the galaxy
- Stop the tyranid invasion
- Stop the chaos advance
- To have fun
- Shield the webway from the current chaos incursions
- gain absolute control of the webway
- Stop the influence of slaanesh
It's too crazy think about an alliance between then sustainted in the exchange of bodies created by the haemonculus for be vessels of the Necrons minds in return of black stone tecnology?
The Drukhari and Necrons doesn't compete for the same territory (in theory and at lest nowdays), the Drukhari can't cause pain to Necrons, and they share enemies.
I'm not talking about be BFF, but an alliance Vect - Silent King could be amazing and give a push up to the importance of both factions on the current fluff.