Board Thread:Warhammer 40k General Discussion/@comment-25177957-20140720052135/@comment-25177957-20140723102451

You know, the Biel-Tan for some reason want to rebuild the Eldar Empire, a task I have no idea how they're going to pull off. There's been much Eldar technology lost in the Eye of Terror. If the Biel Tan Craftworld did wind up successful, the petty Eldar Empire would be too small and would attract attention. I think the Eldar's best bets honestly are to blend in with Tau society. But of course they would hate that. To them the Tau may be even more ignorant than the Imperium due to the atheistic greater good. I'm not sure how well the Tau would deal with a potent psychic race such as the Eldar within their empire ether.

To be honest, the Tau Empire could simply become a massive xenos empire with the Eldar, and that might be the only way for them to face off against the Tyranids, but It's doubtful. If the Emperor was behind the Aun caste, he could reveal himself to the Imperium and some sort of alliance could be formed. I'm sure the majority of Space Marines would accept but the Inqusition would start a civil war.