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My question is can you use a mixture of codex eldar and eldar corsair units from imperial armour 11 in the same force org chart or would i have to bring them as allies? and if i did bring them as allies would they be battlebrothers? has GW ruled on situations like this one? would be apreciated as my lfgs has anew manager and his first battle is against my Eldar and i want him to get off to a bad start! lol

the nightwing and warp hunter are approved for codex: eldar so they may be bought in the eldar codex. However, nothing else may be. Same the other way around.

Corsairs may ally with anything that either DE or Eldar could, including the DE or Eldar codex as per Forgeworld's 6th Eratta.

Therefore, you may take an eldar detachment with Corsair allies or the other way around.