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Eldar from the Craftworld of Illiian-Is are considered secretive and mysterious, even by others of their kind. It is observed that their expeditions hint of some ultimate, overarching goal - but questions as to such by emissaries from other Craftworlds are met only with evasion and obfuscation. Whatever goal this may be, they rarely act alone, striking almost always in concert with allies... allies they are prepared to draw from *any* faction.

But there is a price for such unorthodox flexibility - for some other Eldar have sought to destroy them: after all, if they have appeared on the field seemingly pursuing the same objectives as the ruinous powers of Chaos, surely the Seers of this Craftworld work to destroy the Eldar species, and could not be working to save it?

Eldar (Lexicanum) [wh40k.lexicanum.com]
Eldar (Wikia) [warhammer40k.wikia.com]
Eldar (GW Tactics)